SONYA BAUMSTEIN, a 28-year-old Orlando, Florida, native and former collegiate rower for the University of Wisconsin, has spent most of her life knocking off crazy adventures.

On August 1, 2013, after a year of preparation, Baumstein became the first person to paddle across the Bering Strait. At 8 a.m., Alaskan Inupiaq hunters dropped Baumstein and her 14-foot-long, 25-pound carbon stand-up paddleboard in fog 15 miles south of the Russian island of Big Diomede, west of the International Date Line. She spent the next 11 hours paddling 25 miles in a zigzag line,fighting turbulent chop from three ocean currents that pulled her north, then south, then north again before landing on a sandy beach four miles north of Wales, Alaska.