Join the fun for activity-based learning adventures. On the fourth Wednesday of March and April, an Extension specialist will lead families through a fun activity-based learning adventures designed by 4-H to present the wonders of the natural world. Sign-up to become a Brooker Creek Explorer and continue with the learning activities throughout the year. Please register each member of the family, as space and supplies are limited. 2 to 3:30 p.m. Free; advance registration required. Brooker Creek Preserve, 3940 Keystone Road, Tarpon Springs. (727) 453-6800; www.brookercreekpreserve.org.