1 Bird-watching trek

Minnesota Valley National Wildlife Refuge, March 22 and 24, 8-10:30 a.m.

The refuge is hosting a series of bird-watching treks this spring, each exploring a different unit and a different facet of spring migration. This installment convenes at Old Cedar Avenue in Bloomington for a guided hike in search of migratory warblers. More information: www.fws.gov/refuge/ minnesota_valley/events.html.

2 Orienteering clinic

French Regional Park, March 22, noon-3:30 p.m.

Navigate the woods the old-fashioned way — with a map and compass. Beginners are invited to classes at noon or 12:45 p.m. A special session for teachers and group leaders is slated for 1:30 p.m. Those with orienteering experience are welcome any time between 12:15 and 3:30 p.m. Course closes at 3:30 p.m. Ages 6-plus. $13. Registration required; 763-559-6700. More information: www.threeriversparks.org.

3 Maple syruping in your back yard

Fort Snelling State Park, March 22, 1-2:30 p.m.

Everything you need to make your own syrup — learn to tap trees and evaporate sap, learn what equipment is required to get started at home. Visitors will also learn about the history of maple syrup, with plenty of opportunities for taste testing. For more information: 612-725-2724 or www.mndnr.gov.

4 Desperately seeking spring

Fort Snelling State Park, March 23, 1-2:30 p.m.

Fortify your optimism for warmer weather with a slide show and naturalist-led walk in search of signs of spring. For more information: 612-725-2724 or www.mndnr.gov.

5 Maple syruping demonstration

Lake Maria State Park, March 23, 11 a.m.-2 p.m.

Drop by this open house-style event to learn more about syruping. See how the park's trees are tapped and how sap is collected. Return to the trail center for lessons on finishing and cooking with real maple syrup. Samples provided. For more information: 763-878-2325 or www.mndnr.gov.