John, that website is indeed very good; except in the places where it is wrong. They used to list the area west of Fenqihu (Swallow caves) as a popular trail for locals. It was nothing of the sort. The entire area has been off limits since it was destroyed in the 921 earthquake. I spoke to the tourism board people when I was in Ruili and complained about that section. They promised they would cut it out and it looks like they did.
They also mentioned that you can camp at Daneyigu and you can’t. I suppose I should pass that info on to.
Still, I have found them to be accurate most of the time.
By the way, Fenqihu makes for a great side-trip on the way up or down from Alishan. It’s much less developed and has some lovely hikes. In fact, you can watch the sunrise there too.
As for decent acommodation in Alishan, the mid-range hotels are almost all alike behind the parking lot. If you go midweek you won’t even need to book ahead, though check as this might still be cherry blossom season. For a really nice room stay at the Alishan house or Alishan Gou which are cabins with their own small plots of land. It’s like staying in a little alpine neighborhood.