Located on Route 123 in Peterborough. Casalis State Forest is about a 2.75 mile loop through a state forrest. After descending from the parking lot you come along a beaver pond. This is a great opportunity to catch a glimpse of some wildlife. After leaving the pond continue up a small incline. The main trail veers left, but there is another branch of the trail that goes straight, I'm not sure where it goes. I recommended going left to complete the loop. About a half mile along the trail there is another split. You can go can either way as this is where the loop starts and ends. Along the way you will walk through a beautiful forrest and along a stream, with small cascades. This trail is great for all seasons, hiking, snow shoeing and cross country skiing. It's also popular with mountain bikers. All ages and abilities recommended.