Its friggn hot. I saw many thais 2 weeks ago wearing jeans and even jackets/sweaters which to me is INSANE. I wore shorts the whole time. There is no way I could do all I did wearing pants/jeans during the day.

The Grand Palace/Wat Phra Kheo require you to wear pants. If you wear shorts there, they will let you borrow serong type wraps for women and pants for men.

Most likely you are going to look like an outsider anyways. Just don't dress up as a typical American going to Disney World and you will be fine.

The most popular ATMs I saw were Siam Bank (purple), Something with a U (orange color), and Bangkok Bank (blue).