We travelled to Sigiryia from Dambulla by our rental car, it's an easy ride of about an hour. You can get inside the site by car, the parking spot is by the museum. The ticket price was equivalent of 30 US dollars per person, to be paid in local currency. You get a ticket with three tear off parts representing three checkpoints. It's a lovely walk towards the rock amongst the ruins, the site is well signposted with English explanations. The gallery of the frescoes is amazing and was my favourite part of the whole site. I had to admire the waspish waists and the perky breasts of the depicted women. On a more serious note, I highly recommend leaning closer and appreciating the amount of detail that went into the paintings. 

And then there's the whole large citadel on the rock itself, which you enter via staircase flanked by Lion's paws on each side. The views are wonderful and the whole area surrounding the WHS is green and tranquil. It's quite a steep and narrow staircase, so watch your step and don't wear flip flops as many locals do and then have them fall off. It's pretty hot there all year around, so prepare for sweat, wear sunscreen and have enough water.