A good approach to a Rhineland tour depends on the sort of person you are. Those seeking "Rhine romance" should visit the quaint southern part of it, particularly the Rhine Gorge, with its castles, vineyards, and the Loreley. If nightlife and culture are your preferences, you'll like the cathedral city of Köln and cosmopolitan Düsseldorf; you can still take a day cruise along the Rhine from Köln.