I had a pretty bad tear on my medial, it had inverted and diffused into the joint. I lost about 60% of it. However, you're in shape, so Rehab is a breeze, they'll ask you to ride a bike for 10 mins and then do some stretches basically. It's pretty easy stuff.
I took a week off after mine, you walk out of the hospital, but it's stiff and sore for about a week. After that you can walk around, you'll do it gingerly at first cause you're unsure about putting weight on it. About a month of PT and you're fine. I was back playing football a month after the surgery. Sometimes on long runs during the colder months my knee gets a little(not bad) sore, but other than that I don't really notice it. I guess that leg loses some flexibility, but it hasn't affected me.
The only part that hurt was about 2 weeks after the surgery the PT guy "broke up" the scar tissue to start to loosen the area and allow me to do other exercises. Wow, that doesn't feel good at all.
ADVICE: I'd definitely get the surgery, mine started as a minor tear, but I kept doing sports on it and it got progressively worse to the point of I knelt on it one day and thought my knee had exploded. That was probably the worst pain I'd ever felt in my legs. The surgery is a breeze you're sidelined for a bit, but back up in a month. Plus it's painful to try to live normally on a torn meniscus.