Six Casco Bay islands have year-round populations and are served by ferries from downtown Portland. Except for Long Island, the islands are part of the city of Portland. The ferries offer a reasonably priced way to view the harbor and get a taste of island life. Trips range from a 20-minute (one-way) excursion to Peaks Island (the closest thing to an island suburb, with 1,200 year-round residents) to a 5 1/2-hour cruise to Bailey Island (connected by bridge to the mainland south of Brunswick) and back. All of the islands are well suited for walking; Peaks Island has a rocky back shore that's easily accessible via a paved perimeter road (bring a picnic lunch). Cliff Island is the most remote.