Switzerland's lake Lucerne is among the most scenic lakes in the world where I recommend to take the passenger ship from Lucerne to Brunnen and then Fluelen where you have excellent train connections!
Maybe the most beautiful lake in Switzerland. Which is saying a lot, obviously. I actually recommend taking one of the hour-long boat tours to see the whole thing.
If you get a chance to go for Lucerne Fest (it was July 1 this year), it's well worth the trip. Lots of people, good music and great fireworks. Makes a gorgeous place even more fun.
There are plenty of students studying abroad around here, which is great for you. Rent a paddle boat and take it out on the lake. With the mountains and shops in the background, it's breath taking.
Wir haben eine einstündige Rundfahrt auf dem See gemacht. Die Aussicht ist wunderbar. Ich empfehle euch frühzeitig auf dem Boot zu sein, wenn ihr einen guten Sitzplatz ergattern wollt.