Park Road 37 (PR 37) is a state highway located in the Texas Hill Country.

PR 37 has been noted as an excellent drive by motorcyclists for its views, tight bends and hills.

[2] It has also been called the "Nurburgring of Texas" by car and racing enthusiasts, in reference to the "Nordschleife" section of the Nürburgring.

The highway runs northwest out of the park, before a sharp turn to the southeast near Comanche Trail.

Due to the low levels of the lake, the boat ramp in Plum Creek Cove (near the highway's western terminus) has been closed.