Wow! That's a great time on your Marathon! I just signed up for my first...my goal is just to finish
How about swimming? That's something you could do?
When I quit I was the same...at complete loose ends in the evenings especially. The cool thing about getting sober is you get to reinvent the wheel. Try new things...experiment...take up painting anything is possible when you are sober...I started by cleaning and redecorating my house...its now a home