Kreuzlingen sits on the shore of Lake Constance at the Swiss border, and its railway station, Kreuzlingen Railway Station (ZHU), is a train stop rather than an airport, so no aviation lounge exists here. The station serves Kreuzlingen's cross-border rail connections rather than air passengers.
Kreuzlingen itself sits directly on Lake Constance, the large lake known in German as the Bodensee, right at the Swiss border with Konstanz in Germany, and much of the town's character comes from that lakeside, cross-border position rather than any aviation role. Waiting at the railway station means a modest building with basic seating and ticketing rather than anything resembling a members-only lounge space. The walk from Kreuzlingen's station across the border into Konstanz takes only minutes on foot, one of the more seamless land crossings anywhere in Europe, though that ease of movement has nothing to do with aviation services.
For a genuine airport lounge experience, Zurich Airport is the realistic destination for travelers in this part of Switzerland. Zurich hosts a real lounge landscape, including SWISS Business and First lounges along with independent Priority Pass style options, available through airline status, alliance programs, and paid access in a way that a small lakeside border town like Kreuzlingen never could support on its own. Reaching Zurich from Kreuzlingen typically means a rail connection across the Swiss network rather than any local air link.
If your trip includes a stop in Kreuzlingen, whether for the Lake Constance shoreline or a crossing into Konstanz, plan your actual lounge time for Zurich Airport rather than the station itself. Confirm your specific lounge eligibility and the current rail schedule to Zurich with your airline or card program before you travel, and treat Kreuzlingen as a pleasant border-town stop rather than a place with any lounge amenity of its own.