I've posted several STX suggestions on this forum. Search for more details. Plan a dawn departure, preferably from Salt Pond Bay. Depending on wind angle and seas you might be lucky to head straight to Buck Island, STX, otherwise you'll likely wind up off Christiansted with a 30-40 minute upwind motor to Buck Island. It's a great day stop. About 1.5 hrs before sunset take a leisurely jib-only (with 1 engine as needed) sundowner sail to Christiansted Harbor. Study the chart before you leave as the markers at the harbor entrance can be confusing for a first time visitor plus there is a reef north of Protestant Cay that splits the approach into two channels. Take the eastward channel and anchor 100-200 yds off the fisherman's pier/boat launch at Altona Park. Dinghy to the waterfront for dinner, then return for a walking tour in the morning. Hopefully Fort Christiansted will be open for you at ~8:30. You will likely find yourself wanting to return to Buck Island, otherwise sail north.