If you'd like to add a little more culture to your escape, put Phantastenmuseum Wien on your list. See if guided tours are available or just roam around at your own pace.
If you've got time to stop for a while in Innere Stadt, Phantastenmuseum Wien is a good place to kick off your exploring. This museum is one of many attractions worth checking out here. Schönbrunn Palace, Vienna State Opera, and Hofburg Imperial Palace are also waiting for you close by.