There are several other posts regarding parking but I could not find a recent one so I am posting this info.
As you are driving toward the park, there are several "parking areas" that are not related to the park. They lied and said that they were and that the parking for the park was closed for maintenance and this was where we had to park. I did, but felt something was wrong. There happened to be two police standing nearby and I questioned them about the parking. They were extremely helpful. Went back with me to get my car so that I did not have to pay and chastised the "attendants" for scamming me.
Now, the police won't do anything about it unless you ask, so I was lucky they were standing there. Also, when I told the hotel, I was told that I should have been advised of this when I checked in. So, maybe other hotels warn their guests.
It's a wonderful place, but as with anywhere you have to be on your toes.