I know that legally you have to be 21 to RENT a car, does anyone know of any ways to get around that?
Go to easycar.com, select "Poland" "Warsaw, Intercontinental Hotel" as your collection point, 16/04/2014 as collection date and 23/04/2014 as the drop-off date: the first 12 cars on offer have a minimum driver age of 19. However, the cheapest, a Ford Fiesta, is $372 for the week.
the whole holiday depends on having a car!
For some journeys in Poland, the train is a better choice than a car: why not replan round those journeys?