Through Facebook and myVegas I was able to get us free tickets to the Secret Garden Dolphin and Tiger Habitat at the Mirage ($20 ea value) When you first enter there is the dolphin pools and I think they had 6 or 7 dolphins split up in them and they are trained every 15 minutes or so and you can watch. Then there is the tiger/lion area. Most of the big cats were asleep and you had to watch out for the awake ones incase they decided to pee on you! For free it was a fun time (though souvenir photos were $25 EACH) but I’m not sure if I would have paid to check it out. Or I would have and then been a bit disappointed. There is no time limit though so you can easily spend all day watching the dolphins and cats if you wanted!