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Diamond Head State Monument, Honolulu

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Contact: +1 808 587 0300
Open Hours: Daily 6a-6p
Also known as Le'ahi, this crater of an extinct volcano got its name when Western explorers mistook calcite crystals they found there for diamonds. The historic trail to the 761-foot summit starts inside the crater and is an easy, but steep, 45-minute hike to the top. Stay on the trail, wear appropriate footwear and sunscreen, take along water and bring a flashlight to light your way through the tunnels. Those who reach the summit are rewarded by a spectacular 360-degree view of O'ahu.