There is a wonderful card you can buy in Austria called the Niederösterreich Card. For 60€ it gives one time admission to numerous places in and around Vienna and is a great way to explore Vienna. It is such a good deal we got one for Kathy, even though she would only be here for a brief time.
One afternoon the three youngest boys, Kathy, and I decided to head out and use our cards to ride the train at Schönbrunn. We went after school, and had we realized then what time the train ended we might have delayed for another day. You can hop on and off the train and walk around as much as you like, but since we were later in the day starting out, we just rode the 20-25 minute loop. The train did stop at the Gloriette for a break, so we could hop out and take pictures without fearing we would miss out on the rest of the ride.
I had already been past many of the places the train passed. Kathy and I visited the carriage house, which was amazing. We will never read another book that talks about horse-drawn carriages in the same way again. We rode into the back part of the zoo and past the Palm House. I had not been into the upper part of the woods and I didn’t even know of the Roman ruins that were there. It was a good overview so I can find out what places I need to go back and explore further.