If you're really determined to visit the beautiful Seven Mile Beach on Grand Cayman Island, you could try swimming there, but why not take an easier route? Cayman Airways is the islands' national airline and has been for 37 years. For travel between the islands (Cayman Brac or Little Cayman), you can take the Twin Otter Service. Many other airlines offer flights to the islands as well, including American, Northwest, and Continental. Try  Travel Zoo for some good deals.

Needless to say, many travelers enjoy arriving at Seven Mile Beach by way of an idyllic cruise. There's nothing like seeing the Caymans from the same vantage point that island discoverer, Christopher Columbus, saw them from over 500 years ago. Disney , Princess, Carnival, and Royal Cruise Lines are the most popular. Pick one. It's so much sweeter than arriving by air. 

Though a passport is best, at present a birth certificate or photo ID (a driver's licence) will suffice. If you're a United States, British, and Canadian citizen, passports are not neccessary. Be sure, however, to have any photocopies notarized. This will change as of January 1, 2008, due to terrorist-related restrictions. By this time, all incoming and outgoing visitors will be required to have passports.