Chattahoochee Riverkeeper is holding the second installment of its inaugural Watershed Outings on Lake Lanier on Saturday. The environmental advocacy group will take 25 participants out on its 40-foot custom-built catamaran, Chota Princess II, to educate them about the lake’s history, uses and water quality. The outing will start at the Aqualand Marina near Gainesville, head south to Buford Damn and circle around Lake Lanier Islands.