Saturday, May 21, 10 a.m.-3:30 p.m.  Bring your canoe or kayak and join National Park Service Naturalist Jerry Hightower for a three-mile float on the Chattahoochee River, exploring plants, geology and wildlife. You will encounter three, mild class 1.5 rapids suitable for beginners. Meet at the Powers Island entrance at 10 a.m. to unload equipment. Wear warm, quick-drying clothes and good river shoes. No flip-flops!  Bring lunch and water for a picnic. Reservations required by calling 678-538-1200. $3 park pass or current annual pass or America the Beautiful Pass required. 5450 Interstate North Parkway, Sandy Springs, 30328. Find out more: nps.gov.