After walking up and down the Strip all day in very hot weather, we stopped at the California Pizza Kitchen. It had a nice atmosphere, casual, with a bar and sports playing on the TVs.
The food was excellent. Be warned - the portions are huge! A pizza is about the size of a dinner plate and could easily feed three adults (with all those toppings piled high.) This is a nice place to stop if you happen to be in the Mirage and need a bite to eat. The service was fast and friendly.