One way to get to Preah Vihear is to stay in Ubon Ratchathani and hire a driver to take you there. I highly recommend Mr. Piboon. He knows the Ubon area well, is punctual, and is an excellent driver. If you book him through the hotel, it is 1500 baht per day plus gasoline (500 baht). However, he told us if you call him directly (09-2814094), it is only 1200 baht plus gasoline.
It is about a two hour drive from Ubon to Preah Vihear. It was almost a full day after we spent time touring the temples. He had other places to visit in that area but we were tired and just decided to drive back. After Mr. Piboon dropped us off at the hotel to get cleaned up, he then came back to drive us to dinner. Very good service, I might say.
Walk past the bunkers and the blind guitar player on your way to Cambodia and Preah Vihear. It is a good time to make merit. Why not leave him a donation? He is good!
Walk along this road to Cambodia and Preah Vihear. You do have to pay both sets of border guards 200 baht each. The temple is up the hill in the background and to the left.
You must park near the building in the background and walk to Cambodia. It is about 0.5 km to the border.