We love Riviera Maya and have a spot we really enjoy our stay with. I think Andy on here also enjoys RM with his wife.
Playa is awesome, I highly recommend making a day of that place. Walk slow, check all the shops, stop multiple times for different food and cervezas. Just don't stray too far down some of the shady side streets. The further you are from the main, the less safe it gets.
If you're asked "you like to party?" say "no" unless you're prepared for some skitz stuff.