KölnCard is the inexpensive and convenient way to discover Cologne and take in the Carnival. Get free travel on any public transport for anywhere from 24 to 48 hours and also receive 50% discounts from partners. You can avail yourself one of these KölnCard from the Cologne Tourist Board or the many travel agents around the city. Even hotels and ticket vending machines in public transport destinations should have them around.
Prices usually are €9 for 24 hours’ individual ticket and €19 for group tickets and double that for 48 hour tickets. Obviously making a group and travelling on a daily basis lets you save even further in travel costs.