Treat your driver with respect. They have an important job - getting you and others safely to the destination. Don't be noisy or unruly. The driver needs to concentrate on driving.
Move down the bus and take your seat. Belongings should go under the seat or in the racks, and should not block the aisles.
If you do not have a seat, move down the back of the bus and use handgrips while standing. 
Remember - nothing goes out the window. No papers, litter, arms or heads.
Make sure you know where your nearest emergency exit is, in case you ever need to use it. While sharing the bus with others, show care, courtesy and common sense.
Vandalism is not only stupid but costly. Report any vandalism to your driver