Trail Information The following are recommended State Parks for equestrians. Bear Brook State Park (Allenstown, off Route 28)... Good riding opportunities for horseback riders. This park is heavily forested and is just under 10,000 acres. Pawtuckaway State Park (Nottingham, off Route 156)... This 5,600 acre park has trails open to horses. Pisgah State Park (Winchester/Chesterfield/Hinsdale, Route 119, Route 63)... In this largest of all of New Hampshire State Parks, 13,500 acres of rough forest terrain are interlaced with fine equine riding possibilities. NOTE: Monadnock State Park is CLOSED to equine use.