It is easy to get lost inside Underground Mall at the MGM Grand giant hotel. You can spend days in it and still not see everything it has to offer. It took a few nights after staying here that we actually found the mall by accident. That's why I'm giving you a tip- you need to go check out the basement here and see the amazing underground hidden shopping mall, where you can grab a nice American bite to eat or fill your bags with new clothes. It was definitely a pleasant surprise!