We went down to St. Croix last June and got a Buck Island permit and went for an afternoon. It is a nice spot. There was no overnight anchorage allowed I think due to covid issues. This may have changed

The sail down and back from the south side of St. John is great. I recall reading somewhere that D. Street rated this as two of the 5 best sails in the Caribbean. Pretty much beam reach each way. We had an Island Packet 465 with one reef bouncing off 9 knots on the way down with a bit of a following sea. For me its worth the trip just for the sailing. Keep an eye out for the fish pots around the south drop.