Build a track - Need YOUR help!

Hi Guys,

My father has got a pretty big house with a big garden.
Well, he hates gardens, so I can do whatever I like with it,
the first idea of which I thought was RC Track ofcourse!
Well, it should be as cheap as possible ofcourse, and it's
just to play around on with some friends. I've already made
some drawing, but I want more jumps or something like that. This is what I've got so far:





IMO there's missing something, but I don't know what, jumps or something? But which sort of jumps?
Have you guys got some ideas? And does somebody maybe have pics from a cool off-road track?

Thanks,

Patrick