Comparatively untouched by modern development and despite being constantly crowded, hot and exhausting, it's an experience not to miss. The Chinatown starts from the symbolic China Gate and follows mainly Yaowarat Road.
The Chinese community in Bangkok, descendants of early traders, have been living in Thailand for generations, and generally contemplate themselves very much as Thais; most can no longer speak any Chinese. The area has a somewhat seedy historical reputation for large numbers of opium dens, brothels, pawnshops and a fondness for gambling that used to prevail.
These days, gold shops and pawnshops are nevertheless really popular in Chinatown, and might be found practically anywhere and everywhere. Drug dealing, prostitution and gambling (all now illegal in Thailand) are also nevertheless thought to become widespread in this location - although they are not likely to be really noticeable for the average visitor.
There are also hotels available in Chinatown Bangkok area. A good place to stay if you want to enjoy the great selection of food in Bangkok and Thai Gold jewelry.