My friends and I landed at the Suvarnabhumi Airport of Bangkok city, Thailand at around at around 3AM in the morning and had our hotel booked in Sathorn district which is kind of the center of the city and was equally distant to both the airports in Bangkok.
Didn't make much plans for this city, as it was not the destination we came for in Thailand.
In the morning we went to "The Emerald Buddha Temple" which has the entry ticket of 500Bhat per person that includes visit to the temple and the cultural show.
One point to note is that the cultural show operates only from Monday to Friday but the people at the ticket counter will be giving you the tickets for the cultural show on Saturday and Sunday as well, as it is valid for 7 days. We had our ticket wasted because we couldn't afford to come after 2 days.
Later, we went to the Siam center to pick our tourist sim cards(DTAC) which we already had booked from "Klook" as we got them in pretty cheap rates. You can also buy the same sim cards from the airport as well in around 250Bhat with unlimited internet and 100Bhat worth of talk time.
If you really want to know what the fuss is all about the red light district of Bangkok then give a visit to Soi Cowboy after 9PM because that's the time when all the bars there start operating and continue till around 2AM. Each one will have to buy a drink if you want to go inside a bar.