A little more detail ... you could take a ball in Western Caneel Bay in the middle of the day, then dinghy south and then back east into Cruz. It's a pretty easy turn around Lind point. There's a dinghy dock near the shore where the ferries tie-up. Bring a large dry-bag if you're gonna shop, and a hand-held light for the dinghy. You could catch the activities, and then dingy back after the fireworks are over. It's often wetter on the ride back.