LTMEA Sonic and Surge do lots of sparring in their free time, sometimes they travel around the world (by running or using Sonic's Tornado I if the location is an island) to fullfil Surge's wish to see the world.
After marriage, Sonic and Surge also spend lots of time with the kids. They teach them some easy techniques (like spindash/rolling) or just some self defence tricks. They happen to do some picnic around Mazuri too!