Paddle the Mississippi
Hidden Falls Regional Park
10 a.m.-2 p.m. Saturday
Explore the Mississippi River and its history in 24-foot Voyageur canoes with Wilderness Inquiry guides; canoes hold six to 10 paddlers. It is an "urban wilderness" corridor of rich river habitat. Cost is $45 for adults, $30 for youth. (612-676-9400; wildernessinquiry.org)
Bat count
Whitewater State Park
7:30-9:30 p.m. Saturday
Learn about threats to Minnesota's bats and help count the park's population. Meet at the visitor center. (1-507-932-3007, mndnr.gov).
Bird banding
Lowry Nature Center
9 a.m.-noon Saturday
See wild songbirds up close as they are carefully trapped, studied, banded and released. Drop in anytime. Open to all ages. (763-694-7650; threeriversparks.org)