MapMyRun.com

MapMyRun.com is an essential tool for travelers who wouldn't dream of skipping their run while they're away from home. What's hot: Finding a running route, with maps and ratings, might be the most obvious thing you can do on the site -- but MapMyRun is useful for nonrunners as well. I was surprised to find such options as biking, dog walking, hiking, skating, mountain biking and kayaking.