I'm going to try and look into getting into Groton State Forest in Groton, VT. Probably not huge for wheeling, but it's a large location for camping, hiking, swimming, fishing, canoeing, kayaking, etc. I know it's not free, but not expensive to camp there, though I haven't gone in a few years. Basically you can reserve a leanto, basic campsite for a tent, or in some cases a cabin, though the only ones I saw long ago were pretty sad looking, as if the only full-time occupants were insects and porcupines. I remember on Osmore Pond where I last stayed there are 3 leanto sites, a parking area and picnic shelter, and a family of loons. There was a hiking trail circling the pond to the camps, but we took most of our supplies in by canoe. Unlike saltwater fishing in MA, fishing in VT requires a permit. I didn't fish Osgood for long, but I caught a 13" brown trout, and there are lots more fish in the other ponds and lakes. There are also many many hiking trails and mountains to explore. Let's find out what dates people are available, as this is ideally a 2 day minimum affair.
Columbus Day weekend anyone? Or possibly before?