If you have never been to Asia before then Thailand is definately the first place you want to visit !!!
You will need some Asian travel experience before you want to try Vietnam. Pay for Play in Vietnam is far more of a challenge. Definately go to Thailand- it is not too commercial. Most of the beer from Vietnam sucks.
www.bangkok2night.com
www.pattayasecrets.com
Hit Soi Cowboy go-go bars and Nana Plaza go- go' s in Bangkok. Skip Patpong in BKK.
If you are traveling soon book ASAP- it is just about prime time- high season.
Sanuk