40 Trips To Change Your World
Anyone can hike through the rain forests and dive along the coral reefs of Fiji's Vanua Levua island, but participants in a Seacology expedition can preserve them. The nonprofit helps conserve the island's biodiversity by funding the building of schools and community centers for Fijians, who in exchange, create no-fish marine zones and forest reserves.
Trip Tip: Seacology's weekly diving trips to Namena Island are a must. The miles of reefs make it one of the top diving spots in the world.
Luxury Level: Accommodations are at the Jean-Michel Cousteau Fiji
Islands Resort (fijiresort.com), where 25 private thatched bungalows overlook Savusavu Bay.
Seacology; 510/559-3505; seacology.org; eight-day trips from $2,360 per person, all-inclusive; August 11-18, 2008.