No hitting people or animals or mommy's flowers. No throwing towards someone, even if you don't mean to hit them. No eating. No taking a stick that you found that has been placed in the car in to a store or someone elses house.
Ds is 3. He doesn't ride a bike yet and doesn't want to hold a stick (yet) while riding his scooter, so we haven't crossed that bridge, but I don't see it bothering me.