I did not encounter any 'hidden' fees. Usual taxes and such.
Parking: $32 (Valet) & $37 for over-sized vehicles vehicles
$22 (self park in the adjoining garage).
There are shorter term prices as well (I'm not sure if the restaurants 'validate' parking - you would have to ask them)
You can check out Louisville's website for parking and look up the 'Omni garage'.
I also encourage you to check out their website for all of their policies and rates (ie. pet deposits, etc).
I would give you the links, but Trip Advisor won't allow website links in questions and answers.