I was on US 1 from BH down to Portland last summer. Honestly the drive was not as scenic as I expected it would be. Seems like it took forever to get to Portland and not much in the way of fuel stops. Not sure what you are driving/pulling, but you might could find a few lobster pounds to choose from. I was in a car and not in "RV mode" since I knew I would probably never have an RV up there (from NC); and didn't pay attention to RV related issues like parking etc. I think camping at Arcadia NP would be awesome, but not sure if they have RV sites or not. I think there is a nice looking KOA on the water near BH though...
2012 Puma 30FQSS
2005 Ford F-250 Super Crew 6.0 PSD
2003 Honda Odyssey
1 wife, 1 son, & 1 cat
Asst. Scoutmaster (BSA)