Some friends and I are about to book passage on Celebrity Summit leaving Puerto Rico in April and traveling to St. Thomas, St. Croix, St. Kits, Antigua and St. Lucia. I have never travelled on a ship before and am wondering if anyone can advise me on the number 1 thing to do and see in each of these ports. There are so many options in each port, but time is short and I do want to see as much as possible but also do some shopping. All in our group are over 45 so we aren't overly adventurous or into really strenuous activities but we aren't couch pototes either.