Autumnal Equinox Hike Come on this leisurely hike and explore the changes of the season at Powder Mill Ledges Wildlife Refuge. Join an Audubon naturalist to search for wildlife and plants and learn their facts and folklore stories. Hike is easy/moderate with lots of stops for discussion. Wear sturdy, closed-toe shoes and dress for the weather. Powder Mill Ledges Wildlife Refuge, 12 Sanderson Road, Smithfield, RI; September 22, 2022; 10:00 am-12:00 pm; Fee: $10/member; $14/non-member. Ages: 9 and up.