Lake Placid and Boston

Have never heard of Buttonwood Bay in NY by Lake Placid, NY. Back to the North Pole Resort, if you have a big rig the 100 Acres side is nice, a little quieter.

Buttonwood Bay RV Resort just a few miles north of Lake Placid. RV sites on a lakeside property, with 2 pools, a cafe, hiking trails & a boat ramp.

Normandy Farms is about 25 miles from Boston and close to a commuter rail station. It's a large RV park with lots of amenities. For a more wooded experience, try Boston Minute Man in Littleton. Once again close to a commuter rail station for access to Boston.

Whatever you do, don't drive you RV into Boston.

North Pole is nice, So is the KOA in Wilmington
As far as Boston I have heard that Normandy Farms is really nice.

+1 for North Pole, we prefer the 100 Acre Woods area. It's in Wilmington, near Whiteface Mt and about 8 miles from Lake Placid. There's also a KOA there but we've never stayed at it. There are several State campgrounds nearby but they don't have any hookups.
We stayed at Cape Anne campground in Gloucester (so-so) and took the train to Boston. Last summer we did a night at Boston Minuteman on our way to Maine and we'd stay there again if we wanted to do the area.

For Lake Placid I always stay at the North Pole Resort, great campground and great family that owns the campground.

While you are waiting do a search in the RV Parks section for the two locations.