One should keep an eye on personal things in public places. You should not leave begs and other personal items unwatched under any conditions. Tourists should better refuse offers from individuals no matter how tempting these offers may seem.
Commonly central areas of the city are filled with rather buzzing and vivacious atmosphere even at nightfall. One should not set alone for exploration of the remote areas of the city even in the day time. These districts should better be explored with a guide and a tour group.