I went to Acapulco eleven years in a row and really loved it. However, that was many years ago and now the buzz is that it has really suffered over the years. The narco-trafficking has had an impact there and the place reportedly isn't what it was.
Puerto Vallarta has some good vibes about it, but given the fun you are used to in Thailand and Brazil, I suspect you will not find that level of interest in Mexico.
(sorry Lucky, went to reply to your message and hit the wrong button)