Sukhumvit road is the Bangkok’s primary road and one of the best known Bangkok districts. Most tourists will likely find themselves staying in the Sukhumvit area. If you're a party animal you will find much of the nightlife here. In addition the well-known red light districts, Sukhumvit is also home to western style pubs and clubs making it a popular destination for expats and tourists alike.
You will also find many spots to eat cuisines from around the world located down small streets or 'sois'. Ask your local guide for Thai recommendations! With night-markets selling pretty much anything you can think of, you're in for something great. Let your host know that you are looking for a night out and Sukhumvit is your destination of choice.