You had an amazing trip! If you go back next year try to visit The Mammoth Site at Hot Springs, South Dakota. It is an amazing pit where at least 52 mammoths died and the bones are being dug while you watch. They take volunteers!! I've worked there several Julys. They only dig in July and the rest of the year is spent analysising what was found. It's all enclosed in a climate controled building so the workers are getting to play Indiana Jones in this giant air conditioned sand box. (You can only volunteer through an org. called Earth Watch.) Definitely worth the stop!