We had a wonderful stay in a 2 bedroom unit at the Grand Mayan Riviera Maya in May 2008. They have the single finest swimming pool I have ever seen. I don't play golf, but the golf course is lovely. The food is excellent. I strongly recommend the tour to Chichen Itza with the Cenote swim, especially if you are a history buff. Take some time to visit Playa Del Carmen. The town is delightful and has a beach that is nicer than Cancun's IMHO. We took the Romantic Dinner Cruise in Cancun and had a great time as well. The Grand Mayan Riviera Maya was one of our best exchanges.
The living room has 2 sofas with trundles under them. If I were sleeping on them, I would sleep on the sofa rather than the trundle. Each of the bedrooms has a loveseat that also has a trundle. Our 9-1/2 year old grandson slept on one of those. Some of the 2-bedroom units have 2 double or queen beds in the 2nd bedroom instead of a king. At least I know that the model unit did.
I don't know, but it would not hurt to ask. The model with the 2 beds in the 2nd bedroom was in NV. We were glad to get 2 units with king beds in both bedrooms as we had 4 married couples and only 2 kids. They also have nice portable baby beds that are free if you need them. Just call housekeeping once you get to your unit.