if you stay at a DVC resort through an RCI trade, there is a $95 fee to cover "transportation," i believe.
since you are staying at a disney resort, there is no other charge for parking (at the hotel or parks). use of the fitness room is free. internet used to be $10 a day but it's free at the moment (no telling if that will change). there are other activities that have a charge (like arts and crafts activities for kids -
here is a link to an example - but many activities are free.
if you stay at the swan or dolphin hotel -onsite but not owned by disney - there is a mandatory $12 resort fee per day for access to the fitness room, local calls and internet access and a daily parking fee of $11+tax.