It's kind of a small place and on days with more people it will feel crowded pretty easily. The rails are short, not in the best spot, but okay for learning on. Honestly, I don't think it's that great of a place but that's the only park that's in the area. So if you are close by and want to skate then it might be worth checking out. Also, the people are friendly which is always good.
Here is the website address. http://tsune3.s28.xrea.com/bmx/spot/spot_himeji_casty.html The page is Japanese but there is a map on the left side and pictures of the park on the right. For people not reading Japanese, the red line goes from Himeji JR station to the park.