i always visit circus circus JUST for the carnival games and arcades at the carnival midway. it's this indoor carnival-themed place that goes in a circle with a small magic show playing in the middle.
most games are $1, and if you got kids or you're a kid at heart, how are $1 games not fun!? i won 5 stuffed toys easy and it was just something. my favorites were the balloon popping dart game, the horse race game, chicken in the pot game, and the pounding game.
if you don't have much to do during the day, this is the place to go have fun!