One of the big things to remember is that because you are sitting down, and everyone is distracted, there are a lot of people who don't see you on the
scooter. He needs to make sure he is aware of his surroundings and able to stop quickly, because people will cut right in front of him without seeing him.
Remember to charge it every night.
Carry the charging cord with you even though it is charged--if you have it, you are less likely to need it.
Turn it off when stopped for shows, parades, etc, to conserve power.
Always take the key with you when you are off the scooter. This is a good excuse to buy a cool new Disney Keychain.
Yes, rabbit speed is more fun than turtle, but turtle is a lot safer-- I generally set it somewhere between.
Don't leave anything in the basket that you will be upset about losing if it is stolen.
I have a canvas bag that I got a number of trips ago that has handles that will slip over the steering column and rest on the floor of the scooter between my feet--I keep rain ponchos for me, my family, and the scooter in it (a childs poncho covers the column and basket and lets you stick your hands in the armholes to drive). I also keep a towel in there to either dry off a wet seat, of shield my bum from the hot seat.
Scooters make comfortable places to nap during Lights, Motors, Action.
I carry a collapsible cane in the basket to use when I am off the scooter.