aboard the Blackstone Valley Explorer, at 1, 2, 3 and 4 p.m., departing from Central Falls Landing, 45 Madeira Ave., Central Falls, just over the Cumberland line. Tour guide explains the ecology of the river and surrounding wetlands along with stories about the people and history of the region. Tickets $10 adults, $8 seniors and children. Free admission on the last Sunday of the month. Visit www.tourblackstone.com or call the Blackstone Valley Tourism Council at 401-724-2200.