Google "backyard RC tracks" you'll get a ton of ideas. One thing I can suggest if you're going to have any hard things, like trees, near the track that you could possibly hit, make a safety barrier.... I've done this on my track since we're going around trees. Get one (or more) of those blue foam camp mats and cut it length wise into 8-10in strips six feet long. Then get some 10in orange safety cones and place a few cones around the tree. Then take a strip of the foam and ring the cones and tree with it and secure the ends together with duct tape. Viola! Safety barrier. They work.