Absolutely! I want to say we had 10 - 12 people and I would have felt perfectly comfortable doing it on my own. We actually made Segway friends as we learned how to use them. Hope you have fun!

No. No extra fees

I'd say as long as they are ok standing for the better part of an hour (or 2 depending on which tour you take) and can follow clear instructions, your 9 1/2 year old would throughly enjoy it. There is no real height or weight restriction. Obviously you have to be tall enough to reach the handlebars comfortably to steer and regarding weight, it's quite a sturdy machine but if in doubt, best to double-check.

Yes, I think a 9 1/2 year old could ride as long as they permit it.

If u can balance and like to have fun this is awesome. They do test you out before u start with a 1 on 1 session to make sure u understand how to operate the Segway. If for some reason you can’t and it’s unsafe they won’t let u on. Otherwise it’s quite easy. Wear very comfy sneakers.

yes plenty when we went for the 10am tour.