Hop a sailboat or powerboat to this 176-acre/71-hectare national treasure sitting just a little more than 5 mi/8 km from land. With an underwater snorkeling trail, a sandy beach and an easy hiking trail to great views, a visit is an easy day trip by boat from Christiansted or Green Cay. Open daily during daylight hours. Free admission, but boat fees vary. Phone 340-773-1460. http://www.nps.gov/buis.