The Joy Ride - Family-friendly 5- to 6-mile bike ride, meet between 5-6 p.m. Wednesdays, McCabe's Tavern, 520 S. Tejon St.; tinyurl.com/bzpmq8p.
Mueller State Park hikes - 21045 Colorado 67, Divide. Day pass $7 per vehicle; 687-2366. - Fitness Hike, 9:15 a.m. Wednesday, Visitor Center. - Lost and Geer Pond Hike, 1 p.m. Sunday, Homestead Trailhead.
Striders Hiking Group - New members being accepted for year-round hikes on Thursdays mornings. Hikes average three to five hours round trip; Rick, 465-3690.
Nature programs at Bear Creek Nature Center - 245 Bear Creek Road. Reservations: 520-6387. - Nature Explorers - Hello Solar System, for ages 4-5 with an adult, 9-10:30 a.m. Wednesday and Thursday, $3.
The Colorado Birding Trail website - Coloradobirdingtrail.com, information about places to observe birds and other wildlife.
Colorado Wolf and Wildlife Center - 4729 Twin Rocks Road, Divide; Reservations: 687-9742, wolfeducation.org. - Earth Day Event, 5-7 p.m. Saturday, $15-$30.
Earth Day Celebration - 9 a.m.- 3 p.m., Garden of the Gods Visitor and Nature Center, 1805 N. 30th St. and Rock Ledge Ranch Historic Site, 3105 Gateway Road. Go online for list of activities: gardenofgods.com/educational/edu-1/earth-day.
Colorado Running Co. - For a list of runs and events, go to corunco.com.
Achilles International Pikes Peak Running Club - A nonprofit organization that uses the power of running as a tool to bring hope, inspiration and the joys of achievement to people with disabilities, 6:15 p.m. meet up and sign in; 6:30-7:30 p.m. run, walk or wheel, Mondays, Colorado Running Co., University Village Center, 5262 N. Nevada Ave., Suite 140; Laura, 331-1011.
Mountain Post Running Club - 5K or 10K, 4-6 p.m. Wednesdays, Main PX, 6220 Martinez St., Fort Carson, free. Children, strollers and pets welcome; Kris Spiller, firstname.lastname@example.org.
Pikes Peak Road Runners - Go online for information, cost and registration: pprrun.org. - Bash The Bluffs 5K, 8:30 a.m. Saturday, UCCS Gallogly Recreation and Wellness Center.
Protect the Children 5K - To benefit Court Care, 8 a.m., North Monument Valley Park, West Fontanero Street and Culebra Place, $25-$30. Registration: tinyurl.com/zftel3j.
North Cheyenne Cañon Park - Volunteers are needed for the outdoor education programs at the Starsmore Visitor and Nature Center; Aaron Rogers, 385-6089, email@example.com.
Bear Creek and Fountain Creek nature centers - Need volunteers for assisting with environmental education programs and visitor information services; Paula Megorden, 520-6387, bcfc firstname.lastname@example.org.
Black Forest Animal Sanctuary - Volunteers needed for spring cleaning event, 9 a.m.-4 p.m., 16750 Thompson Road. Registration: facebook.com/socoanimal rescue , bfasfarm.org.
Send information at least two weeks in advance: Email email@example.com.