Went to bar harbor and acadia last year, late June...great ride. Must have been lucky like Crossbowme says - didnt have much traffic at that time of year. Highlight was when in Acadia, rode to the top and started down the mountain and got passed by a bicycle flying down the road. I was doing 45, he had to be doing 10 more than us. Dont know how he made it around those switchbacks. When I got to the bottom and couldnt find him I asked some other guys on bikes and found out he was part of a group of crazy bastards who did this on a regular basis.