You start at http://maps.google.com/ and then you navigate (Search, zoom and pan) to the area that you want to see. Then you click and drag the little person figure on the top left into the map.
All streets that are covered by Streetview now turn blue. (Which is currently just about all of them in Pattaya), then you drag the orange person figure to the street you want to see and release the mouse button, dropping the guy in the spot. You will then see the street view.
See the example of Jomtien beach road below.