I rate this show as one of the very best FREE things you can do in Las Vegas.
For 15 minutes the dancers at the Rio give it all they have on a small stage in the Masquerade gambling are of the Rio.
Their performance is the equal of many shows you pay afternoon vegas prices to see.
Along with the dancers, there are a variety of floats that swing by over the stage. I understand that you can buy a place on one of the floats, so you can be a part of the show.
When the show first started a few years ago, the "Brazilian Carnivale" performers would parade through the casino trying to generate that party atmosphere for the show.
They may still do that, but I have not observed the parade during the past few times I have watched the show.
The performers throw out beaded necklaces during the show, always a treat for those that catch them.
What you want to catch is the high energy performance of the dance troupe. They are supurb.
Great show, even greater price.