A nice idea for a day trip is a visit to the Palace of Schonbrunn; you can easily  go by metro (tickets costs 1.50 euro). There you visit the palace (included in the price of the ticket is an audio-guide). You can choose between 3 kinds of tours; the bigger the tour, the more expensive. The Imperial Tour shows 22 rooms which are marvellous or the Grand Tour shows 40 rooms. Then you can go out, drink your coffee in one of the cafes and spend the rest of the day in this huge park. If you have children visit the Zoo, there is also a tropical plants "house", beautiful fountains and spectacular views.  The palace website is at: http://www.schoenbrunn.at/en/site/pub...  For detailed articles on day-trip destinations, see this list with day-trip suggestions for Vienna's surroundings.