There’s no need to worry about getting fat on vacation. It just won’t happen. Not in St. Lucia, anyway. Hire a local guide and hike to the top of Gros Piton -- one of 2 volcanic spires that dominate the island’s mountainous landscape. After all that calorie-burning fun, take in the beauty of the emerald-blue sea and think of the decadent Creole and Caribbean-style food that awaits you back at your resort. After a nearly 3,000-foot hike, you deserve it!