Dominica
Nature takes the center stage here. Tropical rain forests swathe the island's mountainous heart, an ideal spot to bird-watch or tackle the Waitukubuli Trail, which runs 115 miles north to south. Water babies can splash in jungle grottos like the Emerald Pool and plunge into an ocean-flooded volcano crater that still bubbles at Champagne Reef. Afterwards, simmer in a hot spring at Screw's Sulfur Spa. Dominca's also the most reliable place in the world to spot sperm whales.