Never let anyone slap at, growl at, push at your dog. Always require everyone to treat your dog as you do, with consideration and love. Labs are gentle by nature and are delightful companions who deserve to have their gentleness reinforced with their daily treatment. Don't let children, friends, acquaintenances abuse or overtire your dog. If you see this happening to yours, take him away with you somewhere quiet, pet him, calm him down, and wait with him until you feel it's time to go back to play again.
Labs love to pull, play, chase, etc.
Always keep this fun, happy, playful. Tennis balls are a high priority for Labs, who are born retrievers. It's a great idea to make friends with your local tennis pro who may be prevailed upon to give you the old, used court balls that are too dead for tennis but are just right for your lively Lab. Water is a must for a Lab. They love to swim, especially to retrieve the aforementioned tennis balls.