Thing Valley Road is easily accessed off Sunrise Highway (S1) on Mt. Laguna. It parallels and crosses the Pacific Crest Trail (PCT). It is mostly graded with large humps in the road for erosion control. Some of the humps are tall and steep, enough to think twice about bringing a vehicle with a low break-over angle. There are loose rocks, but 2WD vehicles should manage them well enough.
The route is located in the Cleveland National Forest where dispersed camping is allowed, however, the appropriate passes and permits are required. There are several campsites along the way, including one at the intersection with the PCT.
The road exits the Cleveland National Forest at 2.1 miles and is gated at 2.6 miles with a very small space to turn around.