Most of us travel during summer, but I would recommend to go to Vienna sometime near Christmas Eve. It looks amazing! Especially after dark with all these lights.

what is the best season to go?

Kahlenberg, Klosterneuberg, <Semmering & other places near the outskirts are beautiful to see, take pics & enjoy....

WHen is the best time to visit and what are the best thing to do there beside sightseeing!

Vienna is a great place. The city has an atmosphere of the luxury ancient times, but at the same time it is modern with all present requirements. Beautifull buildings, Hofburg, Schnbrunn, Stefand Dom, etc. And don't forget the Vienna specialties.