They have just groomed the trails within the last couple weeks and they are in excellent condition. They tend to have some little loose sand and can be dusty if there hasn't been rain in a while. So check the weather before you go.
The trails consist of a north and south loop, each one being approximately 20 miles in length, with the north loop having an optional shorter cutoff for 6 miles. The trails are quad-width, and you will most likely see several of the big ones on the (blocking the) trail.
There is a nice staging area that is new this year and plenty of parking. The daily permit is $5 per rider.