Did you know there was a dolphin habitat in the middle of Vegas? We sure didn't until this recent summer trip!! :)
At $22 per adult, it was a fun excursion to take if you have kids. We got to see both the dolphin habitat + the tiger/lion exhibit. What a treat! It is quite expensive though since you will probably pay around the same price for a trip to the zoo, but this is Vegas where the prices are at a premium!
We enjoyed the underwater viewing area, as well as the dolphin "show" that they have every 30 minutes. Kids can take photos w/ the dolphin too (at a $$ price) + interact w/ the dolphins. I'd recommend taking your kids here if you are looking for something to do!