Fiji might be known for its pristine white sand beaches, but thrill seekers are lured by its rugged interior. This itinerary combines the best of both worlds, with a zip-line canopy tourin the Namosi Mountains, white-water rafting on the Upper Navua River (a narrow gorge known as Fiji's Grand Canyon), and a couple of leisurely days spent snorkeling or diving on the Nanuya Island Resort in the Yasawa Islands. O.A.R.S. Highlands to Islands: Ultimate Fiji Explorer, 10 day