Near Sargans, just on the border across the Rhein river from Liechtenstein’s Vaduz lies Weite, in the middle of nowhere. Restaurant Heuwiese is there, and the meadow just outside the Restaurant makes for a nice and peaceful ceremony location. A reception, lunch or dinner can be had in the restaurant, of course.
There are literally hundreds of restaurant locations in Switzerland which would be suitable for a wedding, so this is just one example. You don’t really need that much to pull it off: a romantic location, a ceremony officiant, some chairs or benches – perhaps with white coverings, some decoration like flowers and perhaps a band, a musician or a DJ for a bit of emotional music.