i build trails all the time in the woods. you'll might want to dig up the ground, but it really isn't nessisary. Just make your trails wide enough and when doing the hill, make sure there isn't anything that will cause you to hurt yourself badly like a huge tree in case you wipeout for some reason. Most of all just have fun....if you need more info
contact me in this forum on my site....
www.embt.cjb.net