Do they charge extra for guest parking? Do you have a discount for the parks when you are staying with you?

They charge exorbitant parking fees to EVERYONE.

All the hotels charge for parking including the Disneyland hotel

Yes

Hotel parking does cost money, but reasonable for parking in LA. They also have packages available with room and tickets. We booked through the site and also received coupons and a free lanyard and pin

If you purchase your tickets in a package say tickets in the hotel together usually get a discount as far as parking goes a lot of parking has been changing around there I would call the hotel to make sure what you can and cannot do