I definitely recommend visiting the Jim Thompson House - not only is it an intriguing story (American gentleman who brought Thai silk to the world is mysteriously killed) but a beautiful place. Unfortunately photos inside the main building are not allowed, but the grounds are gorgeous too.
Lots of orchids.
I love the contrast between the dark wood interiors and the bright green of the garden.
The house's exterior.
One of the entrances.
The koi pond, with the biggest goldfish I've ever seen.