You can never go wrong in Bangkok. It is indeed the most popular cities in Thailand and most tourists and expats love here. Aside from quite a few tourists attractions, a lot of people are also the nicest. I've been working here for more than 5 years and living in one condominium in Sukhumvit area.
Nice pictures. I lived in Bangkok for a year, 12 years ago and have travelled there dozens of times before and since. In fact, I was just there 2 weeks ago. It one my favorite cities on the planet!