Kaiwi State Scenic Shoreline

Kaiwi State Scenic Shoreline protects a dramatic stretch of volcanic coastline along Oahu's southeastern tip between Hawaii Kai and Waimanalo, encompassing the iconic Makapuu Lighthouse Trail and some of the island's most spectacular ocean views. The park's name comes from the Ka Iwi coast, and it features the historic 1909 Makapuu Point Lighthouse perched on volcanic sea cliffs. The paved Makapuu Lighthouse Trail is one of Oahu's most popular hikes, offering sweeping views of the windward coast, the offshore islands of Manana (Rabbit Island) and Kaohikaipu, and on clear days, the neighboring islands of Molokai and Lanai. During winter months, the trail is considered one of the best land-based whale watching locations in all of Hawaii. The shoreline also includes the lesser-known Kaiwi Shoreline Trail connecting Wawamalu Beach to the lighthouse area.

The offshore islets visible from the Kaiwi shoreline, Manana Island and Kaohikaipu Island, are protected seabird sanctuaries that are closed to public access. These islands support nesting colonies of wedge-tailed shearwaters, red-footed boobies, great frigatebirds (iwa), and tropicbirds. Humpback whales migrate through the Kaiwi Channel between Oahu and Molokai from November through March, and the elevated lighthouse trail provides an exceptional vantage point for observing these marine mammals. Green sea turtles are regularly seen in the nearshore waters and occasionally bask on the rocky shoreline. The Kaiwi-Wawamalu Restoration Area along the shoreline trail is a significant habitat for the endemic Hawaiian yellow-faced bee, one of the few native bee species in Hawaii. Spinner dolphins are occasionally spotted in the waters offshore, and Hawaiian monk seals make periodic appearances on the coast's rocky beaches.

The Kaiwi coastline is characterized by dry coastal scrubland and grassland adapted to the windswept, semi-arid conditions of Oahu's southeastern point. Native coastal plants including naupaka kahakai, ilima, pohinahina, and paia grass persist alongside introduced species. The Kaiwi-Wawamalu Restoration Area represents a significant native plant restoration project where volunteers and conservation organizations have worked to remove invasive species and replant native coastal vegetation. This restoration is particularly important for the endemic yellow-faced bees, which depend on native plants for nectar and nesting sites. The hillsides along the Makapuu Lighthouse Trail are covered in koa haole and other introduced shrubs, with scattered native species in less disturbed areas. Seasonal wildflowers add color to the landscape after winter rains. The lack of tree cover is a defining feature of the windswept coastal environment, contributing to the panoramic views that make the trail so popular.

The Kaiwi coastline is formed from the eroded remnants of the Koolau volcano, the younger of Oahu's two major shield volcanoes, which was active approximately 2.6 to 1.7 million years ago. Makapuu Point is composed of dark basaltic lava flows with distinctive columnar jointing visible in the sea cliffs. The offshore islets of Manana and Kaohikaipu are remnants of a secondary volcanic vent, with Manana Island's profile resembling a crouching rabbit, earning its popular nickname. The dramatic sea cliffs were shaped by wave erosion cutting into the windward flank of the Koolau Range, creating vertical faces that drop hundreds of feet to the ocean. Tide pools carved into the basalt platform at the base of the cliffs harbor diverse intertidal communities but are extremely dangerous due to unpredictable wave surges. The Kaiwi Channel separating Oahu from Molokai is one of the deepest and most treacherous channels in Hawaii, with ocean depths exceeding 2,000 feet.

The Kaiwi shoreline occupies a transitional climate zone between Oahu's dry leeward south shore and wet windward east coast, receiving approximately 25 to 35 inches of rainfall annually. The exposed coastal position means persistent trade winds sweep across the landscape, creating the characteristic wind-sculpted vegetation and providing natural cooling for hikers on the Makapuu Trail. Temperatures range from the low 70s in winter to the upper 80s in summer, though wind chill can make the exposed trail feel cooler. The area is one of the sunniest on Oahu, and the lack of shade on the paved trail makes sun protection essential. Winter months bring large north and northeast swells that crash spectacularly against the sea cliffs, creating dramatic wave displays visible from the lighthouse lookout. Afternoon cloud buildup over the Koolau Mountains is common, but the coastal trail generally remains clear and sunny.

The Ka Iwi coast has been significant to Native Hawaiians for centuries, with the dramatic headlands and offshore islets featuring in Hawaiian legends and cultural practices. Ancient Hawaiians fished the productive waters of the Kaiwi Channel and gathered resources from the rocky shoreline. The Makapuu area was part of the traditional ahupuaa land division system. The area's modern history is marked by the construction of the Makapuu Point Lighthouse in 1909, which was built to guide ships navigating the treacherous Kaiwi Channel between Oahu and Molokai. The lighthouse features a hyper-radiant Fresnel lens, one of the largest in the world at 12 feet tall, imported from Paris. The light was automated in 1974 and continues to operate as an active aid to navigation under the U.S. Coast Guard. During World War II, military installations and observation posts were constructed along the coast for island defense.

Kaiwi State Scenic Shoreline was established to protect the undeveloped coastal landscape between Hawaii Kai and Waimanalo from development encroachment and to provide public recreational access to this scenic stretch of Oahu's coast. The designation as a State Scenic Shoreline reflects the area's exceptional visual and natural values. The paved Makapuu Lighthouse Trail was created by converting a former lighthouse access road, making the spectacular views accessible to visitors of all fitness levels including families with strollers. The trail has become one of Oahu's most visited hiking destinations, attracting thousands of visitors weekly. In recent years, the State of Hawaii has invested in trail improvements, parking area expansion, and safety measures including warning signs about the dangerous tide pools below the cliffs. The Kaiwi Shoreline Trail, a less-developed coastal path connecting the southern end of the park to Wawamalu Beach, was improved as a partnership between state agencies and community organizations.

The Makapuu Lighthouse Trail is the park's premier attraction, a paved 1-mile one-way hike ascending approximately 500 feet to a lookout point above the historic 1909 lighthouse. The trail offers continuously expanding views as it climbs, culminating in panoramic vistas of the windward coast, Manana and Kaohikaipu islands, and on clear days, Molokai and Lanai across the channel. During whale season from November through March, the lookout is one of Oahu's best shore-based whale watching spots, with humpback whales frequently visible breaching and spouting in the Kaiwi Channel. The Kaiwi Shoreline Trail extends approximately 1.5 miles along the coast between Wawamalu Beach and the Makapuu area, passing through the native plant restoration area and offering a less crowded alternative to the lighthouse trail. The lighthouse itself, with its distinctive red roof, is fenced off and not accessible to the public but is a popular photography subject from the trail above.

Kaiwi State Scenic Shoreline is located along Kalanianaole Highway (Highway 72) between Hawaii Kai and Waimanalo, approximately 25 minutes from Waikiki. A parking lot at the Makapuu Lighthouse Trailhead accommodates the heavy visitor traffic, though it fills early on weekends and holidays. There are no restrooms, drinking water, or food services at the trailhead or along the trail, so visitors must come prepared. The paved trail surface makes it accessible for strollers and most fitness levels, though the steady uphill grade requires moderate exertion. No entrance fee is charged. Visitors should bring sun protection, water, and a windbreaker, as conditions can change quickly. The trail is best visited in the morning for cooler temperatures and clearer views. The tide pools at the base of the sea cliffs are in a closed area and are considered extremely dangerous due to unpredictable wave surges that have resulted in fatalities; visitors are strongly warned not to attempt access.

Conservation efforts at Kaiwi State Scenic Shoreline focus on protecting the offshore seabird sanctuaries, restoring native coastal vegetation, and managing the impacts of high visitor traffic on the fragile coastal environment. Manana and Kaohikaipu islands are designated State Seabird Sanctuaries where landing is prohibited to protect nesting colonies. The Kaiwi-Wawamalu Restoration Area represents a community-driven effort to remove invasive species and replant native coastal plants, creating habitat for the endemic Hawaiian yellow-faced bee and other native pollinators. The popularity of the Makapuu Lighthouse Trail presents management challenges including trail widening from off-trail hiking, litter, and illegal drone flights that disturb nesting seabirds on the offshore islands. Erosion along the coastal trail requires ongoing maintenance to prevent habitat degradation. The scenic shoreline designation itself serves as a conservation tool by preventing development along this visually and ecologically significant coastline, preserving the open landscape and wildlife habitat.