The quickest (and most expensive) way to get there is to hire a taxi outside your hotel. A slower, cheaper way to get there is to take the BTS to Ekkamai and get in the bus. It's air conditioned, and a bus leaves the station every 20-30 minutes.
However, having said all of that, you should know that ALL of the major roads between BKK and Pattaya are torn up and traffic is usually HORRIBLE all the way there...and back. So, it's difficult to tell you how long it will take. But, I'd venture to say you'd spend a LOT more time coming and going than you will on the beach.
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