I am planning my own wedding for Jan 2015 at the Gran Porto Real in Playa Del Carmen... And Also have been to a wedding 2 years ago in the Riveria Maya area.. It is absolutely beautiful there... She was married at the Barcelo Tropical Resort and the wedding was beautiful and we had a fantastic time!
My bit of advice would be to start the planning early... Our wedding isn't until 01/2015 and I've got the resort, photographer, videographer, and DJ all booked! It's NEVER too early!!
Also, don't be afraid to look up outside vendors for services--but DO check with your resort and ask what the vendor fee is for bringing outside services... Our resort is 350.00 per vendor... With that said, some of the outside vendors WILL be worth it!! Just check all the prices and compare the services to what is offered at your resort... For example... We have booked outside vendors for ALL (photographer/videographer and DJ)... First I booked my photographer simply because I fell in LOVE with his photography style... And yes, I am paying more than the resort photograher... BUT the pictures are worth it!!! Also, I asked him if he preferred a videographer and he did have one that he did work with and because they know each other they go in as one company saving me a $350 vendor fee!!
Ask your vendors for referrals!! They work a LOT of weddings and know who you should look into and who you should stay away from!!
Hope this helps!!!
Good Luck with the wedding!!!