I think what section you choose also depends on what time of the year you go. We were there in October during the low season. The resort was under 40% capacity (our first day it was at 12%) so everywhere was really empty. Moon Grand was like a ghost town. It is the nicest section but Sunrise had the most going on. However, from what I understand and other pictures I have seen, in June and July the resort is very busy and the Sunrise pool section is full. I think I would have found that annoying and would have preferred Moon Grand which, will be full but not nearly as crowded. Nizuc was very empty when we were there too. However that is what was great about MP, we had some guest like my sister and brother-in-law who have a child and it was their first vacation away from him and they wanted quiet, relaxazation time together and it was easy for them to find that by going to the Nizuc and Grand Moon section. We also had other guests who couldn't wait to party and were at the pool swim up bar at 10:00am until dinner. I know some say the resort being large can be a bad thing but I saw it as a good thing, it is very easy to get lost if you want private time and still very easy to find friends if you want to as well. We did give the Sunrise swim up bar as a general meeting point for our guests so it was easier for them to find everyone.
Here is a different view on the Sunrise pools, if you walk out the back of the Sunrise lobby this is what you will see
Just another view of the pools again (I have a lot of pool pictures for some reason) To the left in the Sunrise building section
Swing Up bar, Sunrise section. This is in the center of the pool area of Sunrise. It is also very close the brickoven
pizza place (so good). This bar has sushi from 6:00pm-10:00pm every night as well.
Beer drinking contest at the Sunrise pool, mid afternoon
Ok I think that is all I got with out repeating more pool pictures.