Calais is a beautiful city on the St. Croix River. This is an excellent spot if you’re looking for the beautiful Maine coast but without the tourists! Biking Calais Waterfront Walkway Calais Waterfront Walkway, Calais, ME 04619 | (207) 454-2521 ext. 10 “This rail trail offers easy walking along the historic shoreline of the St. Croix