Secrets Maroma Beach and Secrets Akumal are excellent. Went to Maroma Beach for my honeymoon and just got back from Akumal. You can't go wrong with this resort chain. Decent food (nothing terrible, nothing excellent) but exceptional staff and service. My wife and I love the Secrets chain because the beaches are so much more secluded and never feel crowded. You also don't have to bother with the wrist bands and limited quantities of things you see at other all-inclusives.
If you've got more questions, PM me.
Tom