Ramble through three riverfront parks and across one big bridge at this free cross-river walking adventure and scavenger hunt.  Ramblers can pick up a free paper map with walking directions and points of interest to discover at any of three staffed hubs: The Little Red Lighthouse in Fort Washington Park / The N.J. entrance to the G.W.B. North Walk and the Palisades Interstate Park Long Path / The Cottage at Fort Tryon Park. Ramblers can collect a different small keepsake and a unique rubber stamp at each park hub.