Start a family tradition and recycle your ugly ornaments. Find two geocaches and trade new “treasures” with ones you bring from home. Sunday, December 17, from 1–3 p.m., at Eastman Nature Center, in Elm Creek Park Reserve. GPS units and instruction provided. Cost is $5 and reservations are required by December 14. Call 763-559-6700 to make a reservation. There is a 20 percent discount for groups of four or more. This program is for ages 5+.