Make your way to the cruise departure point, Bermuda's Royal Naval Dockyard, at your selected cruise time. When booking, select 10am, 12:30pm, or 2pm.
Once you climb aboard, head for the shipwreck of the 'Vixen' while listening to some informative commentary about the island's history and culture. Through the boat's glass bottom, get views of the reef and the shipwreck itself, then cruise over to the nearby sea grass beds, where transient turtles are known to hang out.
Once the boat drops anchor in just 3 feet (1 meter) of water, grab some of the provided snorkel gear and jump in to explore. You can also wade ashore and beach comb along the shoreline. Climb back aboard the boat and head back to your departure point, listening to island tunes and drinking a rum swizzle from the cash bar.