Just in case BeStevenlyew is just confused and not a troll.
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Anytime you have a choice of visiting a country you have never been to before and the flight is about the same price - choose the flight that gets you to that country in the daytime. This way you can use cheaper transportation to get to your hotel from the airport. Also since you are paying for a full night in a hotel why not actually have it available for the entire time? (You still pay the same price if you arrive at your hotel at 1 a.m. or 5 p.m.) After midnight only taxis are available right now from the airport.
One exception for the flight choices - if you have a frequent flier affiliation you do get lots of miles flying to Thailand from places in Europe or the US. Frequent flier miles means free flights later on or free upgrades to better seats and free lounge use if you are gold or higher (or equivalent.)
During the day hours up to midnight you have excellent rail service from the airport.
http://www.urbanrail.net/as/bang/bangkok.htm
How old are you? What price range are you in for your hotel or hostel? If you are very young - under 30 - Khao San Road may be okay for you . You will have a lot of teenagers around you getting stupid drunk and no rail service to boot! But if you are older perhaps using the Rail Link and Skytrain to a hotel in the Siam or Sukhumvit Road area will be better for you. Don't worry about meeting people. Do you wander around your own country traveling just to meet other people? You will meet people in bars, you will meet tourists on tours and even in restaurants. You definitely will meet women in bars if you are single!
If you need hotel recommendations you should also mention how much per night you want to pay for a room. Any suggestions you get will depend on how much you want to pay!
All of the comments you make could be applied to many countries in the world even your own! Wherever that is!