Narat Grassland is quite beautiful, especially the aerial grassland, which is stunning. You can drive there; just buy a self-driving ticket. There are also shuttle buses. The area is quite large. Panlong Valley Road, however, was just average, not as beautiful as I expected. The river valley grassland was teeming with cattle and sheep, but since it was nearing autumn, the grass wasn't as green anymore.
I happened to be there during a grassland music festival. There were no celebrities, and the audience wasn't large, but the park was very well organized. There were large, clean temporary restrooms, and plenty of police, so everything was orderly. The only downside was that the parking lot was a bit far from the concert venue, as the venue was quite large. Because it's relatively remote, there weren't that many tourists there.