Favorite thing: The climb up the rock can be quite exhausting. It's best to do it early in the morning to avoid the afternoon heat. Bring plenty of water and wear sunscreen & a hat to protect you from the sun. The climb to the top involves climbing a large number of steps. These range from wide stone steps to steep metal steps, these are fixed to the side of the rock. They have handrails which are needed due to the wind and passing other people on the way down. Luckily there are many places where you can stop and rest, you can also take in the magnificent views.
Sigiriya is included in the Cultural triangle Ticket which is a good value to get rather than paying each site separately.
This cost around 40$ (!!) and covers six sights (Anuradhapura, Sigirirya, Polonnaruwa, Nalanda, Medirigiriya, Ritigala BUT NOT Dambulla caves and certainly NOT the temple of the tooth in Kandy.
The ticket is valid for 14 days from the date of first use and within 3 months of purchase. Unfortunately (again) it is valid for a single and NOT multiple entries in one sight.
Sigiriya is the Lion Moutain: it's a 200 metre high rock which once hosted a city and a royal palace. The mind behind all this was King Kashyapa who, in the 5th century, decided to create this 'Palace in the Sky'. The palace, of course, would have been on top of this rock.
Fondest memory: Not the remains of the palace, nor the breathtaking way up on the rock's face - it's the damsels' painting found in a pocket of the rock: there is such grace in those frescoes, such beauty. The best sight in Sigiriya