I was in SP three weeks after knee reconstruction surgery. I had a brace that prohibited my bending my knee very much, and I must say it was very difficult to maneuver the sand and pot holes. But, with determination, and an arm to lean on now and then, I made it OK. I just didn't try to do anything too risky, and made a lot of friends just sitting by the pool or on a bar stool. A broken limb is not reason to not go. Just won't be able to do everything you want to do, but then, you wouldn't be able to do everything you wanted to do if you stayed home, either. The cart rides will be treacherous, so a little pain medication prior to the journey might be in order, at least until you see how he fares. Good luck!!