If you like the go-go bar scene at Patpong, you might want to check out Soi Cowboy and Nana Entertainment Plaza in Sukhumvit, or the enormous "massage parlours" of Ratchadaphisek.
The superhip nightlife also continues at Sukhumvit with trendy clubs and restaurants like Bed Supperclub and Long Table.
River City
just over the edge in Yaowarat and Phahurat, is just like the expensive antique stores in Bang Rak. That district also has similar 19th century colonial-style buildings.