If you are concerned, you cannot access the pool without a magic band that shows you are staying at Riviera. And as with any resort, the restaurants and bar can be used by anyone. We were there for a week and could not say one way or the other if people from CBR were hanging around. Everything seemed normal to me. I didn’t see anyone with a shirt that said “I’m staying at CBR”. Seeing that you were considering staying at CBR I don’t understand. Most of CBR is a long walk away.