Acadia offers bike trails for all ages. Whether you have a road bike or a mountain bike, Acadia is the place to be. Surrounded by rolling hills, biking in Acadia is one of the most relaxing things I've ever done. You could ride your bike along the roads, which would take you from one town to the next. If you like the dirt, you could pick up a map and ride along the carriage roads. Just don't forget to bring plenty of water.

from Bar Harbor (where you get your bike rental), go South to catch, within Acadia National Park, the ocean view road; watch out for cars on this section, but the nice thing is that traffic is 2 lanes, one way, low speed. go past Blackwoods campground and head for Jordan Pond teahouse (possible lunch/tea, there); starting from there, you enter the carriage road system (no more cars): for instance you can take Jordan Pond road North, do Eagle Lake loop, follwed by half of Witch Hole Pond. At this point you will be in the Northern part of the park, 3 miles from Bar Harbor.

This itinerary will take you on the coast, in the hills, through the forest and around pounds: very good alternance of clear views, forest biking, hills and flat terrain. Beautiful during the foliage season (although the park can get crowded at this time of the year).