This ride is a about a hour drive from Fort Worth, but well worth it. This is the same course as the Kiwanis Crazy Kicker rally in October. This course has lots of wide shoulders, rolling hills and Cherry Pie Hill (1.5 mile climb at 6%-8%). As outlined above it is a 66 mile ride with about 3,200 feet of climbing.
Another option is to take 2692 (Section Line and Lakeview Dr.) instead of 3137. This makes the loop closer to 75 miles, plus S. Lakeview Drive is a great road (lots of ups and downs, a few stream crossings, etc.).