Take a horse drawn carriage ride through the city centre of Vienna. It was expensive but fun.
If you have a group of four the price would be pretty good. We went around the old part of Vienna and really enjoyed the ride.
We asked the guy what the horses names were...he thought for a minute then said 'Peter & Paul'...yeah, sounded convincing... ?!??!
Favorite thing: No matter if you are in Vienna alone, on a business trip, or with your partner on a romantic trip, make sure you take this "Fiaker" ride, there are several stations in the center. 20 minutes costs 40E (euro), its expensive yes, but you truly feel the taste of the past times...and don't forget to ask the driver to make a picture, they are very talented photographers!
Favorite thing: No, that's not the Spanish Riding School! It's just the ubiquitous 'Horse Drawn Carriages' that are in every tourist city in Europe now! The Spanish Riding School was actually not open while we were there, apparently they take the horses somewhere cooler during the hot summer months.