Koko Crater Botanical Garden
If you've visited any of Oahu's other botanical gardens, Koko Crater will stand in stark contrast. Inside the tallest tuff (a type of volcanic rock) cone on Oahu, in one of the island's hottest and driest areas, the garden showcases dryland species of plants, including baobab trees, cacti, plumeria, and bougainvillea. Bring plenty of water, sunscreen, and a hat. Though it's close to Oahu's more lush windward side, this is a scorching spot.
