The part where the trail heads south then reaches the parking lot really is being made to sound more complicated than it is. The trail turns right, then spits you out into a parking lot. There is a road heading south from the parking lot that will go to Westheimer Parkway if you follow it. However, to keep going on the trail, just keep going west to the other end of the parking lot and the trail starts again. That trail will take you all the way to Fry Road. Not sure about the mileage if you go back on Westheimer and up hwy 6. Should be able to use mapmyride or googleearth to figure it out, but I don't have access to either here at work due to a firewall.