3 weeks in Bangkok with a few expats to show me the ropes around the place. Bangkok is really amazing once you leave the touristy bits. The malls are fantastic, not to mention the restaurants, suburbs and other districts.
As far as street food goes, Bangkok is well known for it. Once you start living in Bangkok, you're bound to come across them; they are almost every where. One of the most popular one's are along Sukhumvit's Soi 38 (BTS: Thong Lor) and along Saphan Khwai BTS during the day time.
The all Famous Khao San Road to Sukhumvit's Soi 11 (Nana) and Sukhumvit Soi 55 (Thong Lor), Bangkok has more than a few good night spots not to be missed.