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You also may want to consider Cinnamon Bay on St. John. Last time we were there we went to Trunk Bay for a couple of hours and then headed over to Cinnamon for a few more hours and still had time to do a little shopping at the pier. We loved them both but we had the beach at Cinnamon completely to ourselves. I have pictures of both beaches at http://community.webshots.com/user/jean_lynd that may help you decide. They are in the 2 albums on the Explorer. Haven't been to Coki yet so I can't help with that one. It took us less then an hour to get there and back each way. I guess we were lucky with traffic and ferry times. I hope this helps!