Today, I visited the Royal Thai Air Force Museum. The cost is free and well worth the visit. It is open just about everday except holidays from 0900-1600. Close to the Don Muang Airport just off of Paholyothin Road. Now, I am not an expert on airplanes. Hell, i use to jump out of perfectly good ones so keep this is mind as you persue the museum.
They have some really unique planes. This Corsair played a significant role during the Indochina War.