This is a short but fun loop of single track. It is very fast due to the hard pack clay. You need to do it twice (16 miles total) to get a work out. The trail is near Lake Lavon so in the summer you can refresh if there is not drought. Near the end of the trail there are some whip like turns. They are lots of fun.
How to get there:
From Dallas take 35 north to 635. Then 75 north to McKinney. Take 380e to Princeton, a tiny tiny town. Now the hard part. At the Y past the light head north. Follow the road for about seven miles. When you come to a sharp left turn go straight. Follow the new road and finally you will see a sign that says "Sister Grove Park" turn right and about 1/2 mile you will see the entrance. sorry no street names, but there are not any, small town small budget I know I grew up there