If the coworkers at the same level want to socialize with one another that's one thing. If management socializes with one gender more than another, that's a problem. If you're a manager you have to avoid even the appearance of favoritism.
I always wanted to go skydiving. Having a fear of heights would make it hard to jump but more exhilarating. Tried rappelling once and loved it after the first step over the ledge. May try a zip line in the mean time.