10 S N E 1?

No, I have never tried. Some of the higher end hotels in Ixtapa do not allow non guests to play on their cts. I imagine the Viceroy is the same. All the serious tennis is played in Ixtapa and that is where all the locals play.
I play tennis or am on a bike every day so I choose to live in Ixtapa. Zihu is just a hop, skip and jump away when I choose to spend time there, which I often do.