Edited to add: I am glad that you decided to pass on getting the golf cart for your kids. It still would make a fun family thing. My grown kids loved to borrow ours.
elle, I was going to suggest adding seat belts until ...
I am not sure that a 10-year-old has long
enough legs to reach the gas pedal or the brake.
If you are getting the cart for a family thing where you are the driver that might work. Otherwise please check to see if your son can safely reach the brake pedal without having to stand up or sit on the edge of the seat.