Biking in Acadia and Bar Harbor is a wonderful vacation activity

Acadia National Park has about 45 miles of roads for bicycling, but much of that mileage is road shared with autos and walkers, so caution is essential. The 27-mile long Park Loop Road connects many locations in the park, include Sand Beach, thunder Hole, Gorham Mountain. Part of the road, beginning near the Route 233 entrance to Cadillac Mountain in Bar Harbor, is one-way. The rest of the loop road is two-way. The famous carriage roads in the park also are shared with car and walkers. See maps for numerous access points.
The park’s Summit Road, to the top of Cadillac Mountain, is recommended only for very fit and experienced bike riders.
Bike rental shops. Park road maps and alerts.

The Down East Sunrise Trail is the longest off-road portion of the East Coast Greenway, which runs from Maine to Florida. Down East Sunrise Trail is open to bicycles, walkers, horseback riderss, cross-country skiers, ATV riders, snowmobilers and dog sledders. It is located on an rail corridor and is open in all seasons; accessibility depends on weather conditions.
The Downeast Sunrise Trail passes through the woods, marshlands, and coastal villages of Hancock and Washington counties. It consists of the Eastern, Central or Western segments. These segments are from Washington Junction to Cherryfield; Cherryfield to Machias; and Machias to Ayers Junction
Trail map.