The 4 assignments are basically 1,000 word essays, IN ADDITION to your lesson planning. The first one - grammar analysis - is the hardest, and the last one is the easiest. The grammar analysis took me more than 8 hours, and some people worked on it for more than 11 hours! You will need to refer to the books on the reading list; a few copies are available on site but it's easier to have your own.
Rent a motorcycle from Mr Mechanic. They have 3 branches in Chiang Mai old city. I recently wrote an in-depth report about motorcycling in northern Thailand, lots of info you may need can be found here.
There are two classes, of slightly differing ability levels, at IH Chiang Mai. Aged 14-60, male and female, variety of backgrounds. You'll teach each class for 2 weeks (4 classes with each group, consisting of 3x40 minute classes and 1x60 minute class).
I'm from England, there was a mix of people on my course from the UK, US and Australia .... hope you get a group as good as mine, we gelled really well.
In Chiang Mai, popular backpacker hangouts include the bars and guesthouses inside the SE corner of the moat, also near Moon Muang Soi 7 (UN Irish Bar and others). Also the Rooftop Bar, near Tha Phae Gate, is a popular hangout.
Good luck, let me know if you have any further questions!
Cheers