We are headed to Prague for 6 days at the end of the month. I am reading different things about Prague Castle about tours vs going it alone. Can anyone share any good advice for making the most of this amazing sight? Any tips or recommendations for where to start the tour and what things are worth the price of a ticket? Also how long should we allow? We have good guide books but often enjoy a good audio tour. We will go on an organized tour if it is worthwhile. Thanks in advance.