If you want to see Leonardo da Vinci’s The Last Supper, you must book tickets at least 2–3 months in advance. They sell out instantly. For the best views of the city, buy a "Rooftop Access" ticket for the Duomo—it lets you walk among the gothic spires.
The lake is shaped like an inverted "Y." The most efficient way to see the "Golden Triangle" (Bellagio, Varenna, and Menaggio) is the mid-lake shuttle ferry. Buy a day pass to hop between them, but check the last ferry time carefully so you don't get stranded.
In the summer, locals jump into the Rhine with a Wickelfisch—a waterproof bag shaped like a fish that holds your clothes and acts as a float. You can drift with the current through the city center for a truly unique Swiss experience.
The Strasbourg Cathedral houses a massive Astronomical Clock. To see its "Grand Parade" of figures in motion, you need to be there at 12:30 PM. Also, wandering the timber-framed "Petite France" district is best done at sunrise to avoid the heavy midday crowds.
Ludwigshafen is largely industrial but serves as a perfect hub. Rather than staying in the city center, take the 15-minute train across the river to Heidelberg to see the famous castle, or visit the BASF Visitor Center if you're interested in science and innovation.
Don't just stay on the famous (and very touristy) Drosselgasse lane. Take the Seilbahn (cable car) up to the Niederwald Monument. The ride glides directly over the Riesling vineyards and offers the best panoramic views of the Rhine Gorge.
In Cologne’s traditional brewhouses, waiters (Köbes) will keep bringing you small 0.2L glasses of Kölsch beer without you asking. They will mark your coaster with a pencil for every beer. To stop the flow, simply place your coaster on top of your glass.
In Amsterdam, a "Cafe" is where you go for coffee and cake, while a "Coffee Shop" is where cannabis is sold. If you want a traditional Dutch experience, look for a "Brown Cafe" (Bruin Cafe)—historic, cozy pubs with dark wood interiors.
From Basel to Amsterdam, cycling is the primary mode of transport. Never walk in the red-paved lanes or lanes marked with a white bicycle symbol. In Amsterdam especially, cyclists have the right of way and will not stop for wandering pedestrians.
Between Milan and Basel, ensure your train goes through the Gotthard Base Tunnel—the world's longest rail tunnel. It’s a feat of engineering that whisks you under the Alps, often taking you from Italian sunshine to Swiss snow in just 20 minutes.