I think 90% of it is nothing different than business as usual. Hang around, post. If you see a spammer, flag them. If things get really out of hand, step in. When situations with a member (or otherwise) need to be discussed, it usually happens here. Once the season starts the reports should start happening more frequently, but don't feel pressured to oblige every member who wants to use a Mod to hit back at a poster who has upset them.
Keeping the peace can (and should) be a very passive job, and I think everyone's normal presence around here sets a good example.