You are going to LOVE the Moon Palace...I (and most American's I presume) prefer the Sunrise side...But you'll love it either way...The Sunrise pool/lobby are newer and bigger - not that the ammenities on the Nizuc side are anything to worry about....You'll have access to all no matter what side you stay on....
Be sure to book your trips early on...
They will invite you to attend a membership presentation...You can politely refuse if you are not interested and they will leave you alone.
If you'd like to learn more (Although I am am a member, I am most definately not a salesperson!) then you can check out the Palace resorts member thread elsewhen in this forum.
Make sure to visit Xel -Ha and/or Xcaret, if you have not already been there. I suggest signing up to swim with the Dolphins at either as soon as you get settled after arrival...
The nice thing about the Moon is the choice of restaurants...which are all included....your ID bracelet will also get you in to all the other Palace Resorts as well to enjoy the pools/spas/ restaurants....
I suggest the Moon Golf Course over Playacar...
ENJOY!