Fiesta is not a great hotel nor is it very clean! It smells of thick smoke, and you come out reeking of it if you've taken a seat at a slot machine for 5 minutes.
They have average eating options including Gardunos, blue agave, subway and dryers ice cream. For fun, there is an ice arena, club tequila, and a couple longues for the older crowd! I do have to say that they have pretty cheap drinks here, which I never object to. I got a margarita for 99 cents!
Other than what I listed, there's really not much to do here, especially if you have some underagers! I recommend that if you do have kids stayin with you here, you should go ice skating or just hop next door to Texas and see a movie :)