We were upgraded to the honeymoon suite after booking our room block through Tammy. It was soo nice. But either way, all of their rooms are really nice- it's just basically if you care if you have your bed in a different room or not.
By the way, having stayed at Dreams and Riu, I'd definitely recommend Dreams for your HM. It's sooo laid back, quiet, and relaxing compared to the Riu Palace. I'd definitely go that route...