Khao San has a lot to see: Doe-eyed backpackers, the cheapest street food vendors, and general craziness. Also, when the party shuts down in the rest of the city, the after party is just beginning in Khao San. Finally, the Burger King right around the corner is my favorite in the world. If you do want to stay right in the heart of the action, check out Sawasdee House which is a bar, restaurant, and upscale hostel that is never closed.