Want to sightsee the Michael Phelps way?The British outfit SwimTrek (44-208/696-0764;; six-day trips from $889), which conducts group tours that substitute breaststrokes for buses, now offers aquatic journeys around the Great Barrier Reef in Australia and to New Zealand's Bay of Islands—where resident dolphins may provide alternate transportation. Nose plugs and Speedos optional.
—Anya Strzemien