As for the recommended shots, I rather not take any risks and try to get them all, also here in the US, a shot against Yellow Fever is a must, due to the fact that a certificate of immunization is required when you enter back to the US after visiting certain countries, Thailand included.

So if I already must take that one, I might as well get the other ones, plus most last for years so when i decide to travel to other places il already have the shots.