A trip to Hawaii is all about getting out on the water, even for just an afternoon or evening. There are plenty of touristy booze cruises operating from Waikiki, but the Na Hoku II is an outstanding value even before you figure in the all-you-can-drink bar. It's $25 for a 90-minute afternoon sail ($30 for the sunset sail, recommended) and they start serving as soon as you step aboard. The premixed mai tais can be a little watered-down, so go for the mixed drinks for maximum value—and remember to bring cash, as credit cards are not accepted. If you want to be sure of getting a place on the popular sunset sails, stop by during the day and look for the guy with the clipboard to make your reservation.