Dec. 3, 8:30 a.m. to 10:30 a.m.; Friday, 3 p.m. to 5 p.m., Hilton area of Patapsco Valley State Park, 1100 Hilton Ave., Catonsville. Hikers will cover two to three miles and do yoga poses along the way. All ages may attend, but keep in mind that the trails can be steep and rocky. Meet at the Hilton Nature Center. Call 410-461-5005 to sign up or for more information. Cost: free. Donations welcome.