Rule of thumb: NEVER leave Bangkok without going on a temple tour!
Like seriously.This country is home to exquisite temples (or "Wat" in Thai) with fine Buddha images. In fact, they can be seen everywhere for Buddhism is their main religion. Likewise, do pay respect as these are their churches and not just ordinary monuments.
For starters, it's a must to check out the Grand Palace, Wat Phra Kaew, and Wat Pho.
Circa 2008 at The Grand Palace and here's what happens when you don't wear proper clothing:they'll made you wear a sarong!
On this trip, I visited Wat Arun and the city of Ayutthaya. :)