Even on an island know for its breathtaking scenery, Maui Eco-Adventures takes the experience to a new level. Sign up for day-trips into the historic Kahakuloa Valley, with its thousand-year-old taro patches, and to Nakalele Point’s spectacular blowholes and lava tubes. Personalized itineraries are also available: helicopter rides into remote areas, access to secret trails on private land, champagne-and-caviar picnics, and posthike massages on deserted beaches (808-661-7720; day-trips, $70-$110; personalized tours, $6,000 and up).