Observer Editor, Free
“Hike a 1000-Foot Esker”: Waterloo Natural History Association.:
All invited to join a 1.5-mile hike over rugged terrain to a viewing point at the top of the park where it’s possible to see 5 bodies of water. Wear sturdy shoes and bring water. 9-10:30 a.m., Eddy Discovery Center, 17030 Bush Rd., Chelsea. Free. 475-3170. $11 ($16 at the gate) per vehicle state recreation passport required wnha.org/events., . . . . . .