You can use Fusion 360. It is free for personal use.
https://www.autodesk.com/products/fusion-360/personal-form
Then check out this guy for tutorials on how to use it.
https://youtube.com/user/cadcamstuff
You should put at least one long straight, one long jump, and one S curve in it. How big is the area? Maybe do a google maps screenshot to draw the plan on.