Hi! We are going on a trip to Las Vegas (from Alaska, where we live!) for a karate event, and my son would really like to go to a "big zoo" - this desire comes from a visit to the San Diego Zoo this past fall in which he became quite enthralled with animals. I google "top 10 zoos", and get lots of different advice.... but you guys look like experts on this sort of thing. If you were in Vegas and willing to drive 4-6 hours, and wanted to go somewhere different than the San Diego Zoo/Wildlife Conversation, where would you go? Or is there nothing all that spectacular and I'd be better off spending more and flying somewhere close to there (that's a bit more logistically challenging, but if it was worth it I would try to make it happen... !). Thanks for any input/advice!