I just came back from Maine. Took the Bike Friday's to Bar Harbor - Acadia National Park. There is a great loop one way road in the park. We rode around the 'quiet side of the island' - the part near Bar Harbor has too many cars, and we rode on the carriage trails. The carriage trails are 16'wide gravel roads made at the turn of the 19th century for rich people to ride carriages. There are 67 miles of road. I was concerned that the road surface would not be ok since I do not have a mountain bike, but it was fine. It's packed dirt with fine gravel and no ruts. It's like hiking on a bike to lakes and over stone bridges - lovely. So, we just went a little slower than on a paved road. The down side of that area is that lodging is quite expensive.