It can be hard to tell the bare trees apart without their full canopy of distinctive leaves. Join the folks at Tamarack Nature Center to learn a simple key to telling the bare apart, and then set out on a hike to test your new skills. Ages 5–adult. $6.50 per person. 1–2:30 p.m. Tamarack Nature Center, 5287 Otter Lake Road, White Bear Township; 651.407.5350; parks.co.ramsey.mn.us/tamarack.