It is possible to go by car, but I advice to climb the stairs as it always makes you enjoy the view more thanks to efforts provided to reach. The view on the city is nice, the temples itself is not the most beautiful but it has interesting spots. I especially like the bells. Oddly enough (at least for a tourist, it might look normal for locals) there are sports machines inside the temple and people seem to enjoy using them very much. We tried as well and it was indeed a nice experience to exercise in the peaceful temple ambiance. Good walk and visit if you happen to be in Nakhon Sawan. We had to stop in the city for a night break because we were traveling by car from Bangkok to Mae Hong Son. We would not have visited the city otherwise.

Fantastic, can get there by car and walk last few steps, off with shoes as you enter and enjoy the tranquility of a very large temple, buy your candles, set them down and place the sacred gold flakes on the Buddhas, continue to climb to the top and ring the three bells, (don't forget camera for the undisturbed views of Nakhon Sawan, full 360 view of the city) breathtaking, plan so you can have lunch at the extremely friendly family run cafe as you exit, an excellent morning or afternoon out, (we visited on Sunday) A day never to forget : )