What is the best thing to do in Oahu?

For many first-time visitors, one of the best things to do in Oahu is snorkeling at Hanauma Bay Nature Preserve. It’s a protected volcanic bay with clear water and abundant marine life, making it one of the most well-known ocean experiences on the island.

Hanauma Bay is located about 20–30 minutes from Waikiki and is managed as a nature preserve, so access is limited. Non-residents need a reservation in advance, and entry fees apply. The bay is typically open Wednesday through Sunday, with morning entry times and limited daily capacity.

While the water is often calm near shore, conditions can change, and snorkeling isn’t risk-free. Always follow posted guidelines, listen to lifeguards, and avoid touching coral or marine life. If Hanauma Bay isn’t a fit, other top experiences include visiting Pearl Harbor, exploring the North Shore, or hiking Diamond Head.

👉 For more ideas, see our full guide to the best places to visit on Oahu.