The red section has a great mix of technical and speed sections as does the green. The only thing I dont like are that there are a lot of dead 3-4 inch trees sticking up on the green trail. Hitting one dead on can easily flatten a tire, bend a less durable rim, and could throw you down where you could easily end your day or worse. Stay on the Green or Red loops. Blue route is sandy and goes around the lake.
Yellow route is OK because it shares parts of the Red loop.
I rode this trail for the first time last weekend. It was very well marked and a lot of fun to ride. Some sand but not too bad. Stay away from any trails that are not marked difficult as they are likely to be two track or old beat up pavement. The amusement park was the best part of the trails that I rode.