Of course. The ship will offer several overpriced excursions. Safe, easy.

Alternative...
We've rented a car right at the shore side of the old pier. Turn right and drive around the island stopping at several beach and beach bar locations. Spend 3-+ hours and still time to shop or stop at Sr Frogs or Carlos & Charlie's. Lots of fun, and way cheaper than a cruise excursion! Avis , budget, etc.