Congrats from a Cabo Sheraton bride!! Our wedding is less than a month away, and so far, I've been more than pleased with the Sheraton. I found our room rates steep, but that is because of the time of year we decided to get married - we arrive in Cabo on New Year's Eve.
Also, we hired a wedding planner from Weddings in Paradise. Her name is Katie Thompson, and I cannot say enough WONDERFUL things about her! I was apprehensive at first about the extra money, but she has eased/calmed any emergencies and worries, and she is VERY personable. I would personally recommend a wedding planner because they usually (at least for Katie) have an established relationship with the location and know what's going on. We started planning without her, and I was completely overwhelmed.
Good luck in your planning! We decided to get married on Tortugas Beach with the reception in the Palapa. There are going to be 29 of us total, including bride and groom.