Found out I could get out of Bangkok sooner than I thought.
I'm on Sri Lanka Air flight UL 423 from BKK->COL tonight. I arrive in Colombo, the capital city, just before midnight.
Now I just gotta find somewhere to stay, get some malaria tablets (which I probably am supposed to have taken for a week before going to an iffy area), and a guidebook, pronto.
Seeya in a few months Thailand...