I have no personal experience with this, but I have known several people who had active lifestyles like yours, who pretty much continued doing everything they did, throughout their treatment and after. They listened to their bodies, so if they were exhausted, they walked instead run, did slow rides, switched to swimming for awhile, and many added yoga/meditation to help deal with the mental aspect. The only true physical limitations were around weight training. Many years ago, I knew a couple of people who continued teaching at the gym during their treatment. Of course, they took some time off, but they did not stop.
Personally, I think the more you continue doing what you're doing, it will help you make the decisions that are right for you. Good luck dealing with your options.