Remember that all venues, events, establishments, occasions, and people are not child friendly. Check first to make sure that children will be welcomed and accommodated before taking them somewhere new. If you do not go anywhere without your children, adjust your dining/shopping/entertainment/travelling habits accordingly.
Be honest with yourselves about how well your children actually can/will behave and whether or not their personal best is going to be acceptable for a particular occasion. (e.g. "good for a six year old" behavior may be fine for a 45 minute church service, but not for a two hour formal wedding mass.)
Do not use, "I have a cchhiillyyuulllddd!!" as a means to get special treatment, have rules waived, cut to the front of the line, take more than your share, shirk responsibility, etc. Save the "kid card" for true emergencies - which should be very few and far between.