My dad and I built a track behind my parents house. We let alot of people sign up and ride. Had over 500 people signed up. Then some dumbass kids went riding were they should not have been and got caught. Needless to say the township came in and shut us down. So just a word of advice watch who you let ride and keep the amount of people to a minium. Also if you live around any AMA races go and ask for an insurance waiver form. Get EVERYBODY to sign it. You and your wife included. If you cant find one PM me and I can see if I can maybe email you one. It was a nice track. Took about 1 minute and 20 seconds to go around with a local pro on a 250. Had three table top, a rythem section a couple doubles, and an up hill double. The big jump was a 80' table top that only three people cleared. My brother and I are working on getting the track back up and running though.
PS: DO NOT charge money, ask for donations. Charging money = Buisness