The Lowell Parks and Conservation Trust is a private, non-profit land trust comprising a multitude of locations with a variety of activities. Voted Best Urban Adventure & Best of Boston-Concord River White Water Rafting–All equipment provided–Weekends April/May (Call for information / reservations). Other attractions include group tours of historic Spalding House (c.1760) and Concord River Greenway, environmental education programs offered year-round, paddling on the Merrimack River, exploring parks and conservation land, volunteer opportunities, and more! See their calendar of Events on their web site.