Not just pickpockets. Watch out for thieves too; they are very, very fast. We were at Mars Hill admiring the view. I put down my backpack to steady myself to sit down for a photo shoot. I turned away no longer than 5 seconds and my backpack was gone! I knew somebody knicked it so I shouted and quickly ran towards to stairs and saw a man running away with my bag. Somehow he must have felt it too heavy and just dumped it on the ground. I recovered my backpack intact; nothing missing, although everything inside was not of great monetary value; just maps, guides and couple of souvenirs.