Are you looking for a beach day that's not Prickly Pear? I like taking the Marigot ferry to Anguilla, then taking a taxi to Shoal Bay East, which is the most beautiful beach I've ever seen. However, if you want a tour or to see some of the island, once the ferry deposits you, you could ask a taxi driver to take you around the island. I did that once on a cruise stop (in St. Bart's) and it was a fun day.