I wanted to take my 10 month old son to see some fun stuff in Vegas, but also didn't want to pay ridiculous prices for things he wouldn't enjoy or would just sleep through - so free botanical garden it was!
Well first, like I said - it's free. It's beautiful. And my son loved it. Even if he didn't, it was free so we could have just left and been totally fine.
Only drawbacks were, it's pretty small and can get crowded and people walk around aimlessly in front of your stroller or pictures (which isn't the fault of the business but can affect your experience) You can see everything in about 5 minutes so if you are going to that hotel for just this, it's a lot to do just for a short trip.