I'm going to be traveling to Cologne in September, partially to visit Photokina and partially for fun. I noticed a quite extensive tram network in the area, stretching from Cologne to Bonn. Is there a ticket available for tourists to allow usage for a number of days?
If not, is there a system like the public transport cards in use in the Netherlands/London so that you can take any tram/bus, or do I need to buy single tickets for every trip?
I do see the carnaval tickets available right now, but I doubt those will still be available or valid in September. But something like that is exactly what I'm looking for.