GEOCACHING 101, 1:00 p.m.—2:30 p.m. Free for all ages. Looking for a fun way to engage your tech-savvy kids with the natural world? This outdoor activity combines hiking with a tech-aided treasure hunt. No experience necessary. To participate fully, download the free geocaching.com app. Dress appropriately for variable weather with sturdy boots. Bring water and a snack. Rain cancels. Pre-registration requested at (413) 499-4262.

Mount Greylock State Reservation 30 Rockwell Road, Lanesborough, MA 01237.