Also lot's of luck going to Chiang Mai this time of year, it's burning season and the air is virtually un-breathable. If you want to have a decent time hop a train or a bus south to Satun or Penang. At least you can breathe the air down there and have something good to eat.
Or just stay in BKK this is nicest time of year here. It's cool and fresh, just get away from Kao San Road, I wont go there, the place makes my skin crawl.