GARMIN COLORADO 400T MAPPING HANDHELD, $639.99.
Hard-core hikers and novices alike will love this light but rugged GPS handheld. Whether you're trekking through the Grand Canyon or jogging in your neighborhood park, preloaded topographic maps of national, state, and local parks, and a combo of satellite and ground-position signaling stations, provide you with 3-D warnings of steep climbs ahead and almost perfect navigation readings. Wireless connectivity also lets you share meeting points and routes with friends. Just bring extra AA batteries for long hikes — after a few miles in the Poconos, your quads won't be the only things that start to wear out. —Elizabeth Dunlap
WII FIT, $89.99 (Wii system sold separately, $249.99).
Unlike video games that just work your finger muscles, the Wii Fit actually tones your core. As you stand on the sensor board, slow, controlled motions — no "Dance Dance Revolution" feet here — make your look-alike avatar break a sweat in more than 40 different ways, including mastering a hula hoop, doing yoga, weaving through a ski slalom, or head-butting an incoming soccer ball. The real motivator? The system charts goals, heart rate, BMI, and "fit credits" for up to eight people, so you can compare progress with your friends — and even compete. —Sarah Z. Wexler