This is in between Pattaya and Jomtien, just travel up Pratumnak road and turn down into Soi 6 and follow it to the end.
There are a few big condiminums there so I imagine over long weekends it probably gets busy.
They got half a dozen jet skies so the noise level shouldn't be too bad, there are a couple of Thai shack type restaurants and thankfully no touts trying to sell you junk every couple of minutes.
A nice map of Pattaya and Jomtien
It is actually quite nice there, there was about 20 tourists sunbathing and not too much litter on the beach.