Boulder is a casually sophisticated town tucked in the foothills below a rock formation known as The Flatirons. With gorgeous landscapes, a walker- and biker-friendly downtown and plenty to do, you'll be just as inspired as the famously active locals to get out and enjoy a day jam-packed with activities. Boulder was also named a top winter town by National Geographic Traveler, thanks to its proximity to skiing and a downtown vibe that doesn't limit the fun to warm weather.