This day we planned to visit the famous places by BTS , it is a metro here and it is quite costly than Indian metro. We visited China town which is Asia's biggest China town and you can find many restaurants and places where you will feel that u are actually in China.
We roamed around 13 km by foot for exploring whole Bangkok as the taxi operator were charging enormous amount. So we just took bus and reached nearby location by foot. We also visited float market and buddha temple Phra That Lampang Luang which was built around 13th century.
The second place was area nearby Chao phraya river which was also famous for ferry ride experience. After that we went to local food canteen and choose vermicelli to order. "Do not say spicy" because you cannot eat their spicy chillies.
After somewhat local sightseeing we returned to sukhumvit area which is well known for its nightlife. Soi Cowboy and Nana plaza are the two nightlife area where you can see enormous crowd for party , entertainment, and etc.
No body will touch you until you touch them "Keep this in mind".
They barely know English and very weak in English so rely on Google translate or learn some thai words for easy message convey.
Drugs are strictly ban in Thailand and you can get imprisonment for this. So if you are thinking in that way that you may change your plan. Street foods are nice if you are not a Five star restaurant eater and want your trip to be cheap and amazing.