Organized by the San Antonio Parks Foundation, WildFest aims to increase awareness of nature in and around San Antonio, which has been described as sitting “at the crossroads of four diverse ecosystems.” The outdoor fun kicks off on Friday when the San Antonio River Authority and the San Antonio River Foundation host a walking tour of the Museum Reach and its public art features (free, 7 p.m. Fri, May 6, starts at the Park at Pearl, 200 E Grayson). On Saturday, resource specialist Niki Lake and champion trail runner Liza Howard lead a 3.5-mile “interpretive trail run” through Government Canyon with five informative stops along the way ($6, 8 a.m. Sat, May 7, Government Canyon State Natural Area, 12861 Galm; reservations required by calling (210) 688-9055, ext. 292). If that sounds a bit extreme, consider the River Authority’s “Wildflower Hike” along the Mission Reach. While touring Phase I, participants will learn to identify the wildflowers found along the San Antonio River (free, 11 a.m. Sat, May 7, Roosevelt Park, meet at the intersection of Lonestar and Mission). If you’ve got a spring in your step on Sunday, sprint over to Mission County Park, where the Park Foundation’s first-ever RunWild San Antonio 5K steps off at 8 a.m. Runners and walkers can register in advance ($30 until May 7 at saparksfoundation.org) or at the race (6:15-7:45 a.m.) for an additional $10 ($30-$40, 8 a.m. Sun, May 8, Mission Country Park, Pavilion #2, 6030 Padre, saparksfoundation.org). That’s not all WildFest has in store: Visit saparksfoundation.org for the full schedule or call (210) 212-8423 for details.