Pairi Daiza and Hagenbeck would have a word with you at least

Honestly, sleeping in one of the special rooms in Pairi Daiza is currently one of my goals.
Personally I'd prefer Hotels over Playgrounds. Might be because I currently build Amity and it would fit perfectly. Might also be, because even as a kid I didn't care at all about playgrounds in zoos. Playgrounds where an off-zoo activity for me, as I was much more interested in the animals. My mom keeps telling me how, when I was still in the stroller, I always took a nap when we reached the playground.
But honestly my main reason is: I can't see Planco people using that stuff. Even in Planet Coaster they just sit around in rides at the end of the day. And climbing kids etc. would cost so much animation work, that I'd much rather see them invest in animal to offspring interactions between animals.
Hotels, on the other hand, would be another form of income for the zoo and could very well function like the restaurant blackbox or the toilets with no or not much additional extra animation work.