Canal boat tours on weekends and a river-related event kick off the early summer season between Memorial Day weekend and June 19 at Lowell National Historical Park. The Park, one of over 390 units of the National Park Service, preserves and interprets the history of the American Industrial Revolution in Lowell, Massachusetts. The park in downtown Lowell, Massachusetts includes historic cotton textile mills, 5.6 miles of power canals, operating gatehouses, and worker housing. The Park offerings from May 26, 2012 through June 16, 2012 are adjusted for the season. An increased schedule, with canal boat tours offered daily, begins Sunday, June 17.