Thanks, opushomes and adventureadam. Yes, we will be a little rushed, but I'm hoping things will be okay.

We are flying into Vienna then planning to take the boat to Bratislava. Unfortunately, the drop fees on the cars are huge - I think $500 or more to Croatia. Additionally, the agencies who would even offer that already had higher daily rates. I will check with Auto Europe.

We're staying at the Sheraton, as well.