Best Swiss Scenic Drives/Locations?

you could attempt to duplicate the Luzern-Interlaken Express route between Luzern and Brienz over the Brünig Pass. The train uses cog wheel for much of the route and narrow gauge because of its steepness and turns, you can drive a parallel road. The road is on the maps as a motorway but most of it is single lane each way with a solid line down the middle which means that there is no passing for almost all of the two hour drive, you'll be behind whatever is going slowly. That does mean that when you pop out of the tunnels (much of the route is now in tunnels) you will be able to glimpse a view down of the lakes and villages that the train goes next to.

I have done it many times both by train and by car (my own car). I will say that the train is dramatically more scenic But if you have to drive you have to drive. Be careful on the corkscrew tunnel at the Brienz / Meiringen end. It is long, steep and tight.