I was on my way into one of the buildings with some other folks here when I espied this spider. As best I could tell it was an argiope spider. This one was about as big as my outstretched hand. Someone took a picture of me pointing to the spider, but I haven’t seen the photographer since. One of the locals claimed the spider was poisonous. I doubt it was, but all the same I stopped putting my hand near it for size comparisons.
**20080607 Update: I found the photo my friend sent me where I was pointing at the spider. You have to click on the photo to see it in its entirety (meaning both my smiling mug and the spider itself).