In winter, you can head down to Winter Park, or you can ski the nearby Ski Granby Ranch, a family-style ski area that makes it easy to keep track of the kids and also caters to telemark skiers. In summer, there's abundant hiking in the nearby Arapahoe National Forest.
Generally less crowded than Grand Lake, Granby offers easy access to the western side of Rocky Mountain National Park. Lake Granby is one of Colorado's largest, and is popular with trout and salmon anglers.
Not far from Granby are a few of the country's highest-rated guest ranches, where visitors can get excellent horse programs and gourmet meals in elegant ranch settings. They also serve as central locations for everything from hot-spring pools to world-class skiing.