We rented a Retreat Pool Cabana on the Regal for one day on our March cruise this year. It was $50 for half a day. It does not provide complete shade. My side was more in the sun than hubby's which was good as he is the one that has to avoid the sun. He thought it was better than nothing and he was okay with it, but slats on the roof allow some sun through. We did enjoy our afternoon there, especially tea (although it was very late as we got it after the Sanctuary was served).