We have just returned from a USVI-only trip that included an overnight in Magens Bay. There was a slight northeastern swell, but the depth of the bay helped to calm the water before it reached the anchorage. The day we were there (a Friday) was fairly crowded and managing anchoring was a little tricky for some that arrived later in the day. We were able to get a spot close enough to swim in and enjoy the beach. There is a nice little beach bar at Magens, but it does close at 5:00PM. Best of luck and enjoy!