Get an international drivers licence prior to leaving, and don't forget your US licence. Open a Thai bank account to transfer your funds to and use the Thai ATM card here. With the right visa seek out a yellow card, and get a pink Thai identity card, along with a Thai drivers licence.
Some of these will take some time after arriving, but worthwhile when you stay long term.
It's a good idea to have a base..saves lugging your gear every day. go explore, just rent on a weekly basis, so if you find somewhere you like, it's easy to relocate, no long commitment..
I read that many have problem getting a Thai bank account. If you know a Thai we'll enough, open an account in their name, but you only have the card..
Or, for just a short holiday, bear the cost of ATM withdrawals, just draw the most cash you can each time.
It really is no big issue, considering most tourists spend like they're millionaires at the bar....;-)