I love all of the Mayan World complexes. The Riviera Maya one is very nice. I have not been since they built the new Beach Club pool that is right on the beach and for Grand Bliss and Grand Luxxe guests only. I am sure it is wonderful. We have found the service there is great. It is a large complex and like most Mayan World properties, it is out by itself. They do have trams to transport you when you do not want to walk. There are lots of places to go and things to do in the general area though. Tulum, X-caret, Playa-Del Carmen, Puerto Morales are just a few. Cirque du Soleil is at the resort now too.
We really did like the Grand Bliss in Nuevo. The only thing that I do not care for is that there are 2 under-counter refrigerators under the island instead of one nice sized frig. We kept beverages in one and food in the other. The deck was larger that the ones at Grand Mayan. It is also at a huge complex with lots of walking or tram riding.