There is a *small* playground by the pool on the YC side of SAB. There may be another one somewhere but we didn't find it. And they definitely have room service. It was a fairly large menu. I think it's geered towards the YC business/convention people. They had lots of larger dishes that were appropriate for small gatherings.
As far as I know the only playground is the small one by the YC side of the pool as well. We order room service every trip so I can definatly say yes to that one. The breakfast items were basically the same stuff we had a Yacht Club Galley.