I'd guess that you can buy anything on Khaosan. Half a block from my hotel a street booth sold fake IDs including California drivers licenses, international driving permits supposedly issued by the United Nations, international student cards and press passes. They could take your picture and print your personal information on the card while you wait. I passed these up and instead visited a Dr. Fish foot spa where the fish feasted on my dead skin and callouses, particularly my peeling Balinese sunburn.
The food on Khaosan is unremarkable backpacker fare, and everything is international. While drinking a mojito at an outdoor restaurant I watched as a Thai woman, working in a shop that sold dreadlock wigs and Bob Marley hats, painstakingly created dreadlocks in a white tourist's hair. Nearby, a human billboard advertised a Mexican restaurant, and a street vendor sold Latin American style hammocks. Other street vendors wore beautiful Southeast Asia hill tribe clothing, but I suspect it's just their work uniform. Scantily clad women in Heineken outfits advertised a restaurant. Khaosan has a 7-Eleven, a McDonald's, a couple of Subways, and many drunken backpackers from all around the globe.
A highlight of my visit to Bangkok was a spectacular dinner with my two United World College friends, Amporn and Sally, and Sally's husband Narut. Sally arranged a really special dinner at Chakrabongse Villas, a former palace on the banks of the Chao Phraya River. The palace is owned by a woman who is the granddaughter of a Thai prince. A century ago, the prince was set to inherit the throne of Thailand until he committed the misstep of marrying a Russian woman. His granddaughter has converted the palace into a beautiful villa overlooking the river with beautiful sunset views of Bangkok's most picturesque temple, Wat Arun. We were able to enjoy a private dining experience at the palace because the granddaughter is a friend of Sally! Thank you so much, Sally and Narut! I hadn't seen Sally and Amporn in 17 years!
The next day I took a bicycle tour, which started with a tour of a local market where I saw more kinds of hot peppers than I had ever imagined!