Ideas about micro/mini vehicles or clown cars that you can ride.
Simply buy an el cheapo 100CC mini atv/quad. Like this:
And look on your local craigslist for the COVER that will fit over it. Here are some examples:
TOTAL cost project depends on whether you buy used or new.
New mini-atv 110cc is around 500$, used probably half that. Power Wheel– about 265$ new, around 75used$
Thus total cost of project is NEW=800$, USED=$400-500