The palace offers a number of options, but you must do the palace tours with free audio guides. We booked tickets in advance, but the queue in the ticket office wasn’t too bad. In season though, buying in advance is a great way to skip the line. There’s a strudel show in the hour in the cellar of the restaurant - a bit touristy, but good fun and a chance to rest! Finally, worth heading up to the Gloriette at the back of the palace. The views across Vienna are great!