Biking in Greater Portland & Casco Bay is a wonderful vacation activity

Eastern Promenade Trail moves along the shoreline of Casco Bay and Portland Harbor in Portland and water views are continuous during a ride on this trail. The trail runs through Eastern Promenade, which is on the seaward side of Munjoy Hill. This paved trail is open for use by pedestrians, bicyclists, and skaters.
The Eastern Promenade Trail starts at the Bayside Trail, which connects with the Back Cove Trail that encircles Back Cove. The bike and foot trail passes a wastewater treatment plant, crosses a parking lot at Cutter Street, and then proceeds past East End Beach and Fish Point. The trail ends at the ferry terminals, where boats depart for offshore islands. Trail map.
Trail Access: Sewage Plant Road near I-295/Bayside Trail and Maine State Pier at Franklin Street/US 1A and Commercial Street in Portland. There is an access point at Cutter Street.

This tour includes four loops ranging in length from 9 to 33 miles. Terrain is gentle slopes or hilly. Difficulty levels are almost anyone to moderate ability. The 9-mile loop takes you out to Wolfe’s Neck Woods State Park with views of the coast. The 16-mile loop explores the back roads of Freeport and passes Maine Audubon Mast Landing Sanctuary. The 18- and 33-mile loops take cyclists past beautiful scenery of Freeport and Brunswick. See link at ride title to access bike tour maps and brochure with directions.
Trailhead: All rides start at Leon Gorman Park on Bow Street. - Map of the Park

This 1-mile trail is a flat, paved surface through the Bayside and East Bayside neighborhoods. It extends at the south end from Elm Street between Somerset Street and Marginal Way and parallels Marginal Way, linking with the East Promenade and the Back Cove Trails near the highway overpass where Route 1 crosses Back Cove. There are several benches and three water fountains. Trail is good for walkers, runners, and bicyclists.