The Hyatt doesn't have much of a "party scene" but other than that it's great. Beach is perfect, pool is perfect, food is good. Mostly couples, kids aren't allowed. I haven't left and haven't wanted to. Yes it's lazy, that's the point.
OK, that was a lovely vacation - great way to spend Hyatt points with zero planning. I mean it was pretty much non-stop boozing/sleeping on the beach or by the pool, and the weather and water is just silly there. Big resort, nothing was crowded except some of the sit-down restaurants at night (which were mostly just OK). For lunch every day we'd eat seafood at the outdoor restaurant overlooking the beach (best food and it was just great to be there).
Biggest knock is it pretty much shuts down at 9 or 10pm and it would have been nice to have a bar with a DJamer or something without having to leave. One night they had a beach party with a DJamer which was kind of the forced fun people don't like but it was the only time we did anything other than sit in the sun so it was OK. Never did any other activity or really talked to anyone else because we didn't want to. Judging from the hotel strip on the way there I had no desire at all to interact with any of the other dumbasses visiting cancun. Maybe it gets better in the city or wherever but no thanks.
One thing I wasn't prepared for was the legions of adorable little Japanese couples with their ridiculous fashion (like, tons of matching swimsuits) and constant taking photos of themselves giving the peace sign on the beach.
Basically, you would hate it