Visit the USS Arizona Memorial and museum; the visitor center typically open 7:00am–5:00pm—reserve tickets for timed boat launches to the memorial; boat ride fee often small.
Waimea Valley has botanical gardens and a swimming waterfall (open hours typically 9:00am–5:00pm); alternatively pre-book a late-afternoon Polynesian Cultural Center visit and luau.
Start early and stop at Twin Falls, Garden of Eden lookouts, Wai’anapanapa State Park (black sand beach) and waterfalls; many stops have limited hours—check site rules and parking availability.
If you want Haleakala sunrise, secure the park reservation in advance; summit access is very early (arrive ~1–2 hours before sunrise), dress warmly and bring layers.
Full-morning boat trip to Molokini (clear-water snorkeling) and Turtle Town for sea turtles; most tours depart 6:30–7:30am and return late morning—book in advance and check weather.
Book a guided Mauna Kea summit and stargazing tour—summit access and safe transport are provided by tour operators; tours typically depart mid-afternoon and return late evening; dress very warm.
Explore Kilauea Iki Trail, Thurston Lava Tube and steam vents; park access typically open 24 hours but visitor center hours vary—check current conditions and closures before travel.
Drive to Akaka Falls State Park for a quick rainforest walk to the waterfall (park open typically 8:30am–5pm) or head to Waipio Valley lookout for dramatic cliffs and overlooks.
Full-morning Na Pali boat cruise for sea cliffs, caves and snorkeling; if you prefer aerial views, choose a helicopter tour (both require advance booking and are weather-dependent).
Spend your final morning snorkeling or relaxing at a nearby beach—both Poipu (south) and Tunnels (north) offer excellent final swims depending on base location and surf conditions.
Allow extra time for rental return and airport security; inter-island or international departure times vary—arrive 90–120 minutes before domestic flights.