For the guys that mentioned coaching, you should absolutely look into coaching youth at some level. Rec teams, Pee-Wee, junior high, etc. I spent 6 years coaching junior high football (the seniors on the state runner up Gladbrook-Reinbeck team were my last group of 8th graders) and absolutely loved it. I never played past high school. At the time I started looking into it I was just going to volunteer, but they ended up giving me a paid position so I was making some extra money for 8 weeks of work in the fall as well. Obviously it's more of a commitment as you move up in age, but junior high struck a good balance for me - I was able to move my work hours up to be at practice by 3:30 every day but I was always home by 5:30 and didn't have to watch film or anything. On game nights I wouldn't get home until 8 or 9PM depending on where the game was but in junior high there's only 5 games in a season. Pee-Wee/elementary level is even less commitment, with only a couple practices per week and shorter games on the weekends.
You can absolutely get into coaching as a personal interest without quitting your day job. And it's so rewarding to see the kids learn throughout the season.