don;t worry about the exchange; as mentioned bring lots of one and five US dollar bills; but not brand new but also not old looking, worn out, rips tears or marks. I also bring some 10 and 20s but never 50s and 100s. Lot of 50 and 100 fakes around asia and lots of places won;t take them or change them. I changes a 50 one time on a flight to BKK and then found out it was a counterfit.

Hope you have a great time. Cambodia is a magical place. If you want to stay gay, cheap and decent the Golden Banana is a nice place. If you want to stay a more posh. the Shinta is nice.

In Siem Reap, the Linga bar is the gay bar in town. If you check out www.stickyrice.ws they have some travel articles on Cambodia.