I recommend figuring out how to use Google Earth and Google Maps Street View to create custom maps of people's home towns/ cities. How cool would that be? Google already has all the info. It ONLY needs to be captured and coded. 😉
My city (Hamilton, ON, CA) has a 200 foot escarpment running through it, which we call "the mountain," along with the most naturally occurring waterfalls in the world (in one city), and would be fun to drive things off of. It's actually part of the Niagara Escarpment, and... how cool would it be to jump a boat off of the Canadian section of Niagara Falls???
Best of luck, Mods.