I've never been to Maine, so I don't have any specifics to offer. But the Allagash Wilderness Waterway has always been on my "To Do" list. I'd like to check that out if I ever move back east. Also, the Old Town Canoe Company factory is in Maine, and that is supposed to be a cool tour. And of course Acadia looks great! Those are some ideas anyway; sorry I couldn't be of more help.