Hey, Rich: I could recommend two sections, both of which are in Maine. My first choice would be the West Branch Penobscot River, with one night in Lobster Lake and then 2 or 3 nights down the river to Chesuncook Lake. Camping is first-come, first served but usually it is pretty easy finding a site. You can make arrangements for a vehicle shuttle with Chesuncook Lake House. Or, try Mooselookmeguntic Lake and Richardson Lake (there is a real short portage betwen the two). You’ll have to reserve campsites ahead of time on both of these lakes though.