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Soar over the Na Pali coastline, into Waimea Canyon (the "Grand Canyon of the Pacific") and alongside the Jurassic Park waterfall. Two companies that get rave reviews are Inter-Island Helicopters (Tel: 800-656-5009, interislandhelicopters.com) and Air Kauai Helicopters (Tel: 800-972-4666, airkauai.com).
Another way to explore the dramatic Na Pali coast is by boat. Tours leave for a several-hour cruise of the coastline, showing off hidden beaches and caves and usually stopping for snorkeling. Na Pali Catamarans (Tel: 808-826-6853, napalicatamaran.com) is a good bet because it leaves from Hanalei, close to the Na Pali shore.
Kauai has dozens of first-rate hikes—through jungles, over cliffs, and along beaches—but the Kalalau Trail is the most rewarding of them all. The 11-mile trail extends from the end of the road on the north side of the island, but you can only do the first two miles without a camping permit. Every bit of the trail snakes in and out of the woods along the Na Pali cliffs, making for spectacular vistas and great spots to catch your breath and smooch while taking it all in.
Honeymooners with energy to burn can take paddles in hand and explore Kauai with their own two arms. There are two main kayaking adventures: on the rivers or on the ocean. River kayaking is a bit easier, and you can feel intrepid without being sore for days. Kayaking up the Na Pali coast is stunning, but it’s serious work and is best done with a night of camping in the middle. Outfitters Kauai (Tel: 808-742-9667, outfitterskauai) has river- and ocean-guided trips.