Grafton Ponds Outdoor Center, located in historic Grafton, offers year-round activities for all ages. In the summer, the Center offers more than 2,000 acres of mountain biking, hiking, fly fishing, canoe excursions and a popular summer kids camp program for ages 5-16 years. In the winter, it offers 30 kilometers of Nordic skiing (with snowmaking on select trails), 15 k of snowshoeing trails and a 600-foot snow tubing hill. NEW: year round biathlon.