Wikitravel recommends looking for "an elderly looking man named Mr. Zhou" who hangs out inside the park entrance and is apparently a very good park guide. Let me know if that works out for you.
What to eat? There are restaurants within the park, but they are apparently very overpriced, so you’d be better off eating in the village outside the park if you can. Or you can go hardcore and pack dehydrated food (mmmm!).