St Thomas: We took a cab to Coki Beach. Nice and lively beach. Two chairs and umbrella was $15 or $20, I can't remember. Snorkeling was average. Food and drink was available. There was plenty of people providing bar service to your beach chair. We arrived about 10am and it was not too crowded. By about 1pm it was very crowded.
Barbados: Went to the Boatyard by taxi. Paid $15 per person for a chair and umbrella. This cover charge also included one drink, use of the floating iceberg, and rope swing. They had decent showers and restrooms along with lockers. We arrived there around 10am and there were over half of the beach chairs left...I would say by noon they were gone.
St Lucia: We went zip lining with Carnival. It was at Treetop Adventures. This was a very awesome experience. The zip lining staff members we had were top notch!!! We did nine separate zip lines. Afterwards we spent the remaining afternoon on the ship enjoying the serenity area. I wish there was a better shopping area by the ship at this port.
St Maarten: We took a cab to Maho Beach. We arrive by 10am. Two chairs and an umbrella was $20, an additional chair was $10. The Sunset Bar was extremely crowded! It took quite a bit of time to get a drink. We left there at 2:30pm by taxi to return to the ship, it took a half hour drive back. The taxi driver said the lift bridge goes up at 3pm so we wanted to avoid that. We had a great time!