I am in the happy position of joining my sister for a trip to Guatemala, mid-January. Does anyone out there in Tweeter land have advice for me?

I've seen the Peterson Guide to Mexican Birds, and the very heavy and expensive Guide to Birds of Mexico and North Central America. Anything else I should find? Also, any advice about where to go/stay, would be graciously and hugely appreciated!

Thanks in advance:)
Susan
U District
Seattle