I am tempted to get one of this passes just for the fun of it, and worst case I use it for mileage runs and to see these places...But I am not sure which one, all three of them are equally but averagely tempting (Balkans, Germany, or Greece)...I wish some of them were broader...

One option is to get the Greece one and island hope by boat from there, for example.

Btw, the package difference between 30 days and 0 days is more than double.