Last year in summer some friends and I drove to the the The Silvretta Alps with our convertibles. The mountain range is shared by Tirol, Vorarlberg (both in Austria) and Graubünden (Switzerland).
The highlight is the pass road, called the Silvretta Hochalpenstraße (2032 m), which connects the Austrian states of Tirol and Vorarlberg.
It was very much fun to drive on this narrow road in perfect sunshine. There are 34 hairpin bends on the 22 km long toll road. When you come to Tirol, you must try it.
Here is some more information: https://www.silvretta-bielerhoehe.at/en/Silvretta-Hochalpenstrasse
This is a picture from the calendar "Region Vorarlberg in Österreich" by Thomas Deter (for more information please see http://www.calvendo.de/galerie/vorarlberg-in-oesterreich-2/?s=silvretta&type=0&format=0&lang=1&kdgrp=0&cat=0&)