We traveled throughout the New England states 5 years ago and spent 3 months there.
RV parks that we stayed at and would recommend are:
Aces High RV Park, East Lyme CT
Red Apple Campground, Arundel ME
Shore Hills Campground, Boothbay ME
Timberland Acres RV Park, Trenton ME
Sugar Ridge RV Village & Campground, Danville VT
Battleboro North KOA, Brattleboro VT
Good RV parks are rather hard to find and we stayed at some that I would not recommend.
Places that we visited and enjoyed were:
Red's Eats, Wiscasset ME (the very best lobster rolls in Maine) http://www.roadfood.com/Reviews/Overview.aspx?RefID=2959
The Brick Store, Bath NH http://www.thebrickstore.com/
The Balsams, Dixville Notch NH http://www.thebalsams.com/ http://www.travellady.com/Issues/January05...GrandResort.htm
Vermont Country Store, Weston VT http://www.vermontcountrystore.com/jump.js...mType=HOME_PAGE
Rock of Ages Visitor Center, Quarry & Manufacturing Plant, Barre VT http://www.rockofages.com/visitors/index.html
Hope Cemetery, Barre VT http://www.seacoastnh.com/dct/barrecemetery.html
Ben & Jerry's, Waterbury VT http://www.benjerry.com/scoop_shops/factory_tour/
Cabot Creamery, Cabot VT http://www.cabotcheese.com/f1.php?left=men...ht=visitus.html
Cold Hollow Cider Mill, Waterbury Center VT http://www.coldhollow.com/aboutus.html
Maple Grove Farms, St. Johnsbury VT http://www.maplegrove.com/
These are just a few of the interesting places we went. There are lots of old covered bridges, beautiful New England villages, churches and scenery. You could spend all summer there and not see everything. This makes me want to go back.