Oh, Sarah, I envy you! I went to south India for my half-sister's wedding two years ago, and it was such a stunningly memorable trip. I took only a pair of socks, and didn't even work on them--I was so wound up over everything I was seeing that I never found a quiet moment to knit. On the way home, I wrote in my journal pretty much the whole way--two nine-hour flights, my head spinning.
Definitely go with a small project--lace, or socks, or little squares as you say. You'll need room for all the TEXTILES you will bring home. Would love to hear how this trip goes! Pix, please!!!!