There are 3 modern city centers in Bangkok, we are close to all of them (it is not the next door but not far in Bangkok`s scale) if you find each of them on the map – you will easily notice that beautiful Lumphini Park is the center of all Bangkok:
1. SiLom (food, massages, night market and Patpong, rooftop bars, bars with Ping-Pong show, gay area, Japanese Soi Tanya)
2. Siam (most of Bangkok`s shopping like Platinum, Central World, MBK, Siam Paragon etc.),
3. Sukhumvit (Terminal 21, Nightlife (Sukhumvit 11, 13), Bars (Soi Nana), Go-go (Soi Cowboy)
FYI: Grand palace and major temple area is out of Modern city center and have pretty tough traffic situation
Now that you can imagine about where things are going on you can check my location