Be as invisible as possible. Especially when people playing a shot. Last thing you want to do is to distract them. Don't stand in front of tee box when teeing off. Stand at the side or back.
When someone is playing a shot from the fairway, try not to be in front of the person taking shot. Or at least move to a place where ball least likely hit you. Not everyone can aim straight. (i cant aim straight myself all the time) I've seen people slicing the ball amazingly. Ball can fly anywhere one. So always be on the lookout for balls coming your way.