I hope you feel well-rested after your flight and 30-minute bus ride from the Prague airport to the city centre, because you now need to hit the ground running.When the bus drops you off, select any hotel where you'd like to stay. You'll have 20 minutes to check in, then report to the following nearby address for a tour that will last 2 Hours and cost Kč250. Show this address to anyone in town and they can direct you to the desired location:
Staroměstské nám. 1, 110 00 Josefov, Czechia.
Here's what Wikipedia has to say about this popular attraction:
The Orloj is mounted on the southern wall of Old Town Hall in the Old Town Square. The clock mechanism has three main components — the astronomical dial, representing the position of the Sun and Moon in the sky and displaying various astronomical details; statues of various Catholic saints stand on either side of the clock; "The Walk of the Apostles", a clockwork hourly show of figures of the Apostles and other moving sculptures, notably a figure of a skeleton, representing Death ... On the hour, the skeleton rings the bell and immediately all other figures shake their heads side to side, signifying their unreadiness "to go".