dont worry for nothing, i travel to Bangkok
alone last November. I little female with nothing experiend about travel alone, but i still safe and ok.
I stay in youth hostel, just for sg 10 for single. (but you must be a member (www.statravel.com).
Just carefull with tuk-tuk, never go to place tuk-tuk offer to u about cheaper gem, cloth or anything.
Take a walk and never go out in the night if you alone , unless u know where you go. and never take anything from someone you dont know.
If your face like Asean, just dont say anything for any word, sometime u can get price for local. That happend to me :-)).
Well, have a nice trip, and if you go as backpacker" be a real backpacker:-)).
cheers.