Make your way to the Royal Naval Dockyard at the cruise departure time (departure time varies by day) and climb aboard a comfortable snorkel boat. Head out for the fringes of the Atlantic reef, the cause of more than 300 shipwrecks over the years.
See some local sights on the way to your destination, then visit the site where the Montana and the Constellation are shipwrecked. Learn about the history of the shipwrecks, then dive in to explore the abundance of coral and marine life yourself. Spend about one hour snorkeling.
Hop back on the boat and refresh yourself with a rum swizzle or a nonalcoholic drink on the way back to the shore.