(GMT)08 SEP 2017 KEPA2:
Drive from Geneva airport to Leukerbad(the spa town in Valais);
For road trip Geneva to Leukerbad: best views along Lake Geneva (lac Léman) are from NE shore and hills above. Montreux, Chillon (castle), Vevey as best known places, slightly longer detour for Gruyères for instance. Easiest is using motorway to at least Lausanne, then possible stop at the service area with great views (Restauroute de Lavaux), a rest area with great views too above Montreux. Leave highway for a stop at least at Chillon (usually some free parking space available). After Villeneuve highway is in Valais main valley, interesting sites for instance Martigny, Sion. And plenty of lateral valleys for scenic side trips.
Italy can be reached from Valais by car via either Grand-St-Bernard (pass or tunnel) to Aosta as first larger town, or direction Domodossola via Simplon (mountain pass road, or car on train for railway tunnel from Brig).
Austria is more than a mountain range away. One option is Rhine valley (where you could add Liechtenstein - detour that for most people hardly makes sense) and cross the border to Austria. Or aim for Engadine valley (much more scenic) and cross the border there.