Lace up your shoes, grab a helmet and don’t forget a reusable water bottle — San Antonio’s largest free community event returns on Sunday, this time taking over the streets of Midtown to celebrate National Ride a Bike Day. YMCA of Greater San Antonio’s Síclovía has been inviting residents to come and play in the streets since 2011, closing roads to traffic and opening them up to pedestrians, bicyclists, skaters and their furry friends. It’s an effort to encourage San Antonians to go outside and engage in more physical activity, giving them a chance to exercise and explore in a car-free environment.