ive torn my left ACL twice... I feel your pain. Your doctors are letting you get surgery right after tearing it? With my experiences, they told me to regain most of my movement/strength BEFORE i go in for surgery, which meant about 2 months. In that time, I went skiing quite a bit, nothing too extraordinary, but I had fun.
What are your options for a graft? My first surgery was patellar tendon, and my second was a donated graft, which Ive had ever since. I recomend that bc Ive been doing pretty well with it so far, almost 20 months apres surgery.