I just got back from a weekend at Lake Umbagog at a remote site. We stayed at R15 which is about 8-1/2 miles up the lake. Amazing experience, really great campsite, good boat access and dozens upon dozens of smallmouth caught. What a beautiful lake. If you don't have a boat you can be shuttled to your campsite with your gear and they will even bring you kayaks and/or canoes. You can stay at the main campground too, and rent kayaks and canoes. The only downfall is it is incredibly difficult to get a reservation at any of the remote sites. The good sites are likely reserved for the rest of the year.