"This is New Hampshire’s largest developed state park and one of the best for snowshoeing. The park encompasses more than 10,000 acres, including marshes, bogs, mountain summits, and ponds, and a spider web of trails, more than 40 miles in all. You’ll find something to suit all ages, abilities, and energy levels. We’ve spent several winter days exploring the trails that criss-cross the forest, fields, and slopes of this southern New Hampshire preserve, and still haven’t seen it all.
It’s heartily used in summer; there’s hiking, biking, swimming, fishing, rafting, a twenty-station fitness course, artillery range, and a small museum complex. While Bear Brook State Park slows down when the mercury drops and the snow flies, it still get a fair amount of use from cross-country skiers, snowshoers, snowmobilers, and hard-core (read; crazy!) mountain bikers. The park campground closes in mid-October, but if you’d like to spend a few days exploring the park, check out nearby Circle 9 Ranch. The 125-site campground stays open all winter, offering entertainment and heated bathrooms."