It is 50 miles from Bangor, ME. Continue on I-95 north to Bangor, Maine, then take Route 1A east to Ellsworth. In Ellsworth, take Route 3 to Mount Desert Island. Acadia National Park is very accessible because of their Islander Explorer service as well.
Jordan Pond and The Bubble Mountains are very popular destinations when visiting Acadia National Park. It is a beautiful area to hike, bike, or just sit down and enjoy your surroundings.