We took a whole day to visit some temples in Thailand. Now, there are a lot of temples in Thailand but we managed to pack in only two — The Grand Palace (which has a lot of temples and museums in one complex) and the Temple of Dawn, Wat Arun. It was fun taking the ferry to and from the two sides of the river. Thailand is truly a marriage of the old and the new, fusing modernity with tradition and religiosity.
P.S. I have notes here how to get to these temples from Silom/Sukhumvit without taking a cab