I'm seeking for advice from the ones who has been in Thailand ...

You can book this with almost any hotel. There are several versions of this Ayutthaya tour, take the one with evening dinner cruise. I made the mistake of not taking the dinner cruise and was stuck in traffic for an hour and a half because the tour ... In order of (my) preference: Phuket â€" Samui â€" Pattaya. In Bangkok I recommed doing a bicycle tour. That way you can see a lot of the city whrere tourists never come or go to. You'll see how normal Thai people live and work. ...