Espiritu Santo

Espiritu Santo, Vanuatu — the country's largest island, a WWII South Pacific staging ground now known for wreck diving, the glowing Blue Holes, and Champagne Beach.

Dive the SS President Coolidge, one of the world's largest and most accessible wreck dives, a converted troopship sunk just offshore in 1942. Millennium Cave requires a guided jungle trek and river crossing to reach, and the freshwater Blue Holes — especially Nanda and Matevulu — are a swimming-hole highlight found nowhere else on the island chain.