We went to Dickinson Bay to a beach area next to the Sandals resort. Nice beach, lots of vendors though, selling jewelry, jet skiing, baskets, etc. Beach was very nice - there is a mexican restaurant that was good for lunch down past Sandals at Antigua Village (you can't use Sandals restaurants).
I don't like the Antigua shopping area. Lots of vendors selling lots of junk made in China. Picturesque but not my cup of tea.
We did not do much in port besides take a taxi to Boatyard Beach, which was close by and recommended by the crew. they had chairs and umbrellas for rent, a bar/grill, a pier with a diving platform and rope swing, and a water trampoline. The beach was clean, water was fairly calm and many of our crew were on the beach with us. We had planned to stay at the beach for 2-3 hours but ended up staying most of the day. Highly recommended.
I highly recommend the zipline trip at Morne Coubaril on St. Lucia. It includes a boat trip to Soufriere with views of the Pitons, followed by a really great zipline trip. The first line starts off a 60 foot platform and there were 8-10 ziplines from platform to platform. Our guides took safety very seriously; we were always hooked up with a safety line and had a thorough safety briefing beforehand.
We've been told that roads are slow and narrow, which made taking a powerboat to Soufriere a much more enjoyable trip.
Our sources in the crew said that going into town was not worth the trip so we did some shopping at the dock.
We booked the America's Cup Sailing excursion through Celebrity. The excursion was fantastic and I would highly recommend it (I would rate the actual trip a 5+), but it was supposed to start at 11:30 and it was 1:00-1:30 before we finally started. It wasn't clear why - one of the crew said another cruise ship was late docking and the first trip of the day was delayed because of that, throwing off our trip. My complaint is that we were kept waiting on the dock for over half an hour with no information or explanation. Then we were moved to the shopping area and told it would be another half hour. Then we moved to the taxi dock for another 20 minutes before the tender finally arrived. We all loaded into the tender then spent another 30 minutes as we went to the 3 sailboats, and swapped places with the earlier excursion. As expected we were hot, frustrated and angry by the time we finally got on the ship. If they had told us that the trip would be delayed we could have gone off and done something else instead of just SITTING and WAITING. Someone on Celebrity should have informed us of these delays, offering us the choice of a cancellation, and America's Cup Racing should have kept them informed. I complained to Guest Relations on Celebrity and received no satisfaction, except that they would speak to the vendor. A partial refund would have been appropriate.
We took an open air cab to Sapphire Beach, clearly the most beautiful beach on our 7 day cruise! It's at the other end of the island and the taxi cost $10/person each way, but it was still cheaper than the cruise line's excursion price. You can also rent a car for about $65/day (we found out later), but they do drive on the left.
There are chairs to rent, snorkeling gear, floats, and a small grill for lunch. Sapphire Beach resort looked to be in very bad shape and one of the buildings was under renovation but the beach was still gorgeous, with views of St. John, lots of trees for shade, and piles of coral swept up by the tide. Snorkeling is right off the beach ($5/hour). There is a turtle grass area to the left where we saw sea turtles and rays. On the right is a reef with many types of colorful fish but sadly the reef itself looked very very stressed. I only saw 2-3 fan corals, some brain coral and some staghorn (?) coral. Things have changed so much over the last 15 years.
Magens Bay is also a beautiful beach but there is no real snorkeling there.