It might come as a surprise that there is no inter-island ferry service in the Cayman Islands. However, if you're vacationing in Grand Cayman and looking to check out the lesser-traveled Little Cayman and Cayman Brac, there are a number of other options.
Tourists and locals are able to charter yachts and catamarans for tours and private excursions. Though the cost may be a bit steep, the cost typically includes a full crew and knowledgeable guide. Hotel and resort staff can direct you to a nearby marina.
In Cayman Brac, private boats are available to take you over to Little Cayman for as little as USD$20 each way. At under an hour round-trip, it's an experience you can't miss out on.