I'll just start out by mentioning what pretty much anyone who's seen the first movie and the trailer for this one suspected. It's the exact same movie, just in Thailand instead of Vegas. I'll also say that the first movie was better.
This time around, since all the characters were familiar to me, it wasn't as funny when they pulled the same gags as the first movie. Alan is still clueless and odd, Phil is still telling everyone to just calm down and figure things out, and Stu is freaking out over every little thing. There are enough new bits in there to be worth at least seeing it, I wouldn't recommend spending too much on it. I only spent five dollars, so I'd say I got my money's worth. It was funny, but not as funny as the first movie. I'd say if I hadn't already seen the first movie, I may have liked the sequel more than I did.