Only one person should be on the approaches of any pair of lanes.
Be patient; the idea is not to distract other bowlers.

Be ready to bowl when the pins are set.  Do not bowl until the pin setting machine has
 completed its cycle and the sweeper is raised, otherwise you may damage the ball or
machine and you could be charged for its repair.

Do not touch another player's balls or equipment without their permission.
It may sound funny, but seriously, people do get frustrated and distracted.

Stay on your own approach while delivering the ball.
Return to the seating area after making each delivery.

Observe one lane courtesy.  Don't go up onto the approach if a
bowler is aiming or taking his shot on adjacent lane. The bowler on the right
should bowl if both reach the approach at the same time.
Stay off the approach while you wait.

Do not carry refreshment onto the approach or players' sitting area.
Spilled liquids and food damage the sliding sole of expensive bowling shoes, and can create problems for all bowlers.

Good bowling requires concentration. Bowlers should always keep in mind
when others are preparing to bowl, excessive movement or noise could be distracting.
When a player is ready to bowl, give them the courtesy of making their shot without interference,
as you will want the same courtesy when it is your turn.

Excessive "lofting" hurts your game and damages the lane.

Control your emotions on the lanes.
Refrain from using abusive language or obscene gestures.
Kicking the ball rack does not help anyone.

Play the game to win, but be a gracious loser.
Remember, good sportsmanship is always the key to a successful game.