Cool volcano explosion! Not sure why Yelp has a $ beside it, but it's a free public attraction outside of the Mirage casino/hotel. It only runs at night though, which makes sense because the temperatures are a bit cooler at night.
It gets pretty warm during the actual volcano "explosions" so be careful if you're standing really close to it. Also people tend to cluster around the railings, so be mindful of your belongings and children. Personally, I struggled with taking nice pictures of it, since it was mixture of being careful with my phone/camera and also the sudden brightness contrast.
Well worth a visit one night!