There are several tracks there. #1 is a SX style track that is comperable to the Fox valley off road track, with the exeption of a huge table top. This track is hard pack.
#2 is a deep sand track, long, mabye 3/4 of a mile long. this sand will swallow you whole. my kids on their 80's couldnt make it around because of 1 of the uphills. it is fun on a bike or quad with horsepower though.
#3 there is a sandy trail system throough the woods. it several miles long and you could spend plenty time back there. it has a lot of deep sand also. its plenty wide for a quad.
They do have a building with bathrooms.
I think the admition is reasonable, $10 or so per person.
have fun, Walt
ps.. I thought you had all bikes