RIU Palace Las Americas in Cancun - also walkable to shopping and bars.

We are building a home just north of Playa but have enjoyed both the RPLA and RIU Cancun when staying in Cancun. Our favorite family-friendly AI is Iberostar Tucan in Playacar just south of Playa, and our favorite adults-only is Secrets Capri just north of Playa.
For the cheapest and best private transfer look at Canada Transfers, for one. The ADO bus is very cheap and comfortable if going into any if the towns but does not stop at resorts.

"Travel changes you. As you move through this life and this world you change things slightly, you leave marks behind, however small. And in return, life — and travel — leaves marks on you.”
-Anthony Bourdain