recovering and regaining fitness after ACL surgery

Snapped my ACL playing football a couple months back and now into six weeks post-surgery. I was very active before in many sports inc. boxing. At the moment i'm doing daily physio on the operated leg and light upper body weights to keep the body ticking over.

Physio says I can't run for atleast another six weeks, but swimming may be two weeks off. I know how quickly cardiovascular fitness regresses. Anyway I was just looking for any advice for mantaining as much fitness as possible, if anyones had a similar op what did you guys do? Finding it hard to push my body without playing competitve sports or being able to run.