You may wish to consider the following for planning your race weekend travel to Valencia Circuit:
Parking at the circuit is free to ticket-holders and does not need to be pre-booked.
Valencia's Central Bus Station also provides a bus service which take you to the centre of Cheste.
You can take a train from Valencia centre direct to Cheste using the C-3 line of Cercanias-Renfe. From here there is a 10 minute walk to the circuit. The trains can get very crowded however; but are very inexpensive.
The interactive map below shows the location of Valencia Circuit. Use the controls to view the circuit as a traditional map or as satellite images, move around, and zoom in and out.