If you go to Guatemala, I highly recommend a visit to the market at Chichicastenango. This is where we found the best deals on souvenirs, and where we had the most fun haggling for those gifts.
Even if you aren't interested in buying souvenirs, Chichi is a great place to people watch. Taking pictures can be tricky, because it is very crowded, but I managed to get a few good shots. I saw some tall photographers and wished for their height. I am 5'1", and it was difficult to see over the crowd.