In the heart of the South Pacific, the postcard-perfect islands of Vanuatu deliver lush green landscapes, clear tranquil waters and an interplay of dramatic reef topography and WW-II wrecks seasoned with brilliantly-colored marine life. Reefs and wrecks are scattered all across this expansive archipelago, but the epicenter of underwater activity is Espiritu Santo, where the intact hulk of the 653-foot SS President Coolidge rests within easy swimming distance of shore. The largest dive-able wreck in the hemisphere is worth at least a dozen dives, but is just one of many underwater adventures that include a submerged field of vintage war ordinance, and offshore sites visited by sharks and other pelagics