I just found out a very important bit of information for those using the Venice Italy cruise port, Venice Terminal Passeggeri. The port takes online reservations (no money involved) for parking spaces at the port garage. They WILL NOT guarantee parking places if you don't reserve in advance.
Parking for a week cruise will set you back 90 EUROS!!! Ouch
Venice Terminal Passaggeri Website
Good thing I'm saving several paychecks for this cruise.