We've camped at the Queechie/Pine Valley KOA twice and like it. I know some on here don't like KOA but the owners/managers are nice and it's a pretty wooded campground. Best thing is its location and usefulness as a hub to tour the area. It's in Central VT near the NH border. Will you have a toad? From Queechie, Woodstock and Sugar Bush farms is basically local. Stowe is only a couple hours north. Played disc golf on a mountain course in Killington. Picked blue berries in NH.
I have brochures but haven't camped in NH or ME. Harold Parker State Forest is a beautiful wooded area with lakes north of Boston, not far from NH. I haven't camped there but hiked on day trip. You can find info online about camping.