Sorry for the delay is responding with an update. I’ve been back home since Sunday. Not sure if this question was answered. Yes, MB access only to the Oasis pool.
A brief update on our stay. It was our first at the Poly. Overall we loved it!! We are staying there again this summer. We did not experience any room checks and spent 2-3 hours each afternoon in our room. My DD has a medical condition. Usually she is completely healthy, at other times she gets quite run down and needs extra rest. She had a flare mid-way through our trip (first half we spent at Pop Century). I explained this at check-in and requested two things: morning housekeeping and not to disturb us in the afternoon. Well, they did an excellent job at the latter. However, there was no morning housekeeping. There was no knock for afternoon housekeeping (even though we saw carts in the hall). There was no security knock (though by day 2, I wish there had been...I would have asked them to send housekeeping in). I called later (3 or 4) both of our first afternoons, as we were headed back out, to request housekeeping visit our room. The first day they did not. So I took out the trash myself. We still had towels so I just let it go. The same thing happened the second day we were there!! We came back to our room at nearly 9 PM to discover no housekeeping. DD desperately needed to get to bed, but we ended up over at the desk instead complaining (we had no towels left and needed to shower). InexplIned what had happened. The manager was very apologetic. She immediately called housekeeping and sent someone directly to our room. While housekeeping was there, she took my DD to Moana Mercantile and let her pick out anything at all in the store and then purchased it for her. My DD was ecstatic. The remainder of our trip we had no housekeeping issues, but that was really ridiculous. I was quite upset. Otherwise great stay there, we loved the pools and had a semi-obstructed view of the fireworks from our Raratonga (3810) room! That was a nice surprise!!