Red Square is another good place for happy hour in Mandalay Bay.  I love that the bar is cold, so as not to warm your drinks.  That's a great idea.  I had whatever was on happy hour special, and remember it being strong.  Plus, I also ordered calamari, which for $5 was fine, but nothing special.  Though that was also placed on the ice, so it chilled fast. It was just something  to go along with our drinks so that we would not end up too drunk.  But the drinks (I think I had three) were great, and I'd return anytime.