Best wishes for a successful surgery. I certainly hope you're cancer free.
I would urge yoiu to ask your doctor what kind of activity you can safely participate in both pre and post-op. I have no personal experience with cysts, but one of my best friends has had several ovarian cysts removed her doctors strictly limited what she was allowed to do both before and after surgery.
Assuming you don't have any pre-op restrictions, it sounds like you're already in great shape. There's little you can do in 12 days to improve on that really, so just do what you most enjoy or what best relieves your stress. Don't wear yourself out too much. I think you should try to be well rested and well hydrated prior to surgery.
I definitely think you need to discuss your post-op activity with your doctor. Whatever advice they give, take it. Another good friend of mine learned the hard way after a hysterectomy that when the doctor says no running she means it (her vagina prolapsed, which led to another surgery and recovery period).
On a bright note, my friend that had several cysts gave birth to a healthy baby in December, despite only having about half an ovary left.
Best wishes for a speedy recovery!
Live with intention. Walk to the edge. Listen hard. Practice wellness. Play with abandon. Laugh. Choose with no regret. Continue to learn. Appreciate your friends. Do what you love. Live as if this is all there is.
--Mary Anne Radmacher