We go to the Gulf side alot. If you are interested email me and I can give you my tripadvisor ID for hotel reviews.
I've stayed at
Royal Playa Del Carmen- Great hotel, 1 block from shopping, large.
El Dorado Maroma- Very Small and intimate, amazing room, outdoor shower and plunge pool...secluded paradise and just a stones throw from the major company that does fishing, diving, snorkel, cruises, ect if you want to sigh see.
Secrets Maroma- Number 5 beach in all the world on Travel Channel. AMAZING
Valentin Imperial Maya- Great Room, tiled jaccuzi overlooking ocean, Great Food, Sea Turtle Release, extensive beach and grounds.
All were romantic and all inclusive, and priced between 1500-3000pp with air.
I think Playa is more suited for those who aren't into the party all night atmosphere.