Feel the heat as you trek over active volcanoes in Volcanoes National Park. Get back to nature on a secluded fern grotto swimming trip. Explore the rainforest on your way to hidden lagoons where you can bathe sans clothing if you wish. Scuba dive in little-known caves. Kayak your way around deserted offshore islands. Take part in a tribal run through Waipio Valley. Paraglide from Popoli Sate Park (6,400 ft) down to the beaches. Or party all night long with locals. You can do it, and this guide shows you how. Each adventure is rated for risk and adrenaline rush. Risks run from "Novice-Friendly" to "Professionals Only." Adrenaline meters start with "Kid Stuff" and rise to "Absolute Hairball." Includes extreme mountain biking, trekking, snowboarding, surfing, hang gliding, active volcano hiking, diving, swimming with dolphins, paragliding, partying, zodiac rafting, windsurfing, and snorkeling.