Wizz Air is more or less a standard budget airline, with the difference that they charge for carry-on bags.
On the whole, I’d recommend the two-day Dresden-City-Card if you want to visit most of the museums it gives access to, and you’re planning on using public transport more than once during your stay.
A Köln Welcome Card might be good value in some circumstances, but it doesn’t offer as much value as other, similar, cards.
If you’re planning on visiting more than one museum while you’re in Bonn, and use the public transport as well, a Bonn Welcome Card represents great value for money.
Nuremberg has a lot to offer, and a Nuremberg Card will help you see a fair percentage of it.
Leo Express is a great option for city-to-city transport in the Czech Republic.
Ryanair’s policies might drive me mad, but for the price I’ll certainly fly with them again.
Naviera Armas is a good choice for Canary Island ferry trips.