River trail
Interstate State Park, 10-11 a.m. Saturday
Wear good hiking shoes and bring water for this 1.25-mile hike that starts at the southern end of the park and ends at the glacial pothole area. Expect rocky footing and hills in places. Recommended for adults. (mndnr.gov/interstate; 651-465-5711)
Carley Bluebell Festival
Carley State Park, 10 a.m.-3 p.m. Saturday
An event devoted to the spring wildflower, it includes trout fishing programs for children, archery for visitors ages 8 and older, walks to check out wildflowers and more. (mndnr.gov/carley; 1-507-312-2300)
Spring bird migration
Mille Lacs Kathio State Park, 1-1:45 p.m. Saturday
There will be a talk and slide show about migration, as well as a lesson on how to use binoculars. You'll also hear tips on attracting birds to your yard. (mndnr.gov/millelacskathio; 1-320-532-3269)
Field skills
French Regional Park, 1-3 p.m. Saturday
Learn geocaching basics and search for delicious treasure: s'mores. Children 17 and younger must be accompanied by a registered adult. Reservations required. Call 763-694-7750. (threeriversparks.org)