Antihistamine tablets are useful, both for unexpected hayfever (different pollens out there) and also for bug bites. I dished mine out to quite a few people. Maybe a multi vit tablet too, you won't see much veg for 2 weeks!!!
Think Jo covered most other stuff though, and like stu said pack light, no smart clothes needed.
Oh and a hat! For when the rooms don't have hairdryers. #girlsproblems