Grapetree, United States Virgin Islands offers 1 beach perfect for sunbathing, surfing, swimming, and more. Grapetree, Saint Croix, United States Virgin Islands, is known for the historic Grapetree Bay Hotel and its proximity to the scenic Point Udall, the easternmost point of the United States. The best time to travel to Grapetree, United States Virgin Islands, is from December to April, with average air temperatures around 77-82°F and water temperatures about 79-82°F. Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!