There are hostels inside the park, costs around CNY200 per night. But it is hard to access, since it is not allowed to stay inside the park for environment pretection reasons. There are many hotels and hostels outside the park, I think it is very easy to pick one for you. These days the Mid-Autumn Festival and the National Holiday will start, you'd better book room in advance in case there is no room when you arrive. Good Luck!