I think the fall is the best time to visit New England. It depends on what you like to do but if you rent a Class C in New Haven Ct. Austin Hawes CG on the Farmington river is nice as well as the Housatonic Meadows CG both in CT. A drive up RT 100 in Vt is also nice. The Kangamugus Hwy(RT 112) in NH is beautiful as well as some hikes right off the hwy are also nice. Most CG.s close after Columbus Day but some stay open all year. The Fryburg fair is going on at that time and you can camp right on the grounds for $20/night. At trip up RT 16 to Mt Washington is also a nice drive and there is a nice NFS CG(Dolly Copp) right there also. All these CG's are about $20 per night if you like to dry camp. If not there are a number of FHU CG,s in and around Conway right on the Saco river that are nice but you will need reservations for those. Enjoy your trip hope this helps.