No low passes. And no one has defined a low pass. Some people think its below 40 feet.
Bad rules, or any additional rules beyond the AMA saftey code could be used to deny an insurance claim by the company holding the policy. For that reason, it is absolutely self defeating to create addition rules which may be used against the club to deny insurance claims.
Of course there are exceptions, ex: don't fly near the neighbors chicken coupe (or he will sue us). Rules that make you a good neighbor and avoid noise related confrontations are always helpful.