Hi there! We are actually getting married there in less than 2 months. The Grand Bay has been wonderful to work with. Yolanda is our wedding coordinator with the resort and has been helpful, responsive, and great about working with us on every detail. She normally responds to us within 48 hours of our email or phone call (and most of the time sooner than that). We rented the Meson (the private hotel) next to The Grand Bay and will have most of our guests staying there. I am very impressed with the service we have received. You will be treated as a VIP b/c they limit the number of weddings and events hosted there at one time. The only downside to the location is that there are limited days that the airlines fly into Manzanillo. Thur-Monday are the only days with flights coming in and out on Continental. We have 35-40 guests going. Our wedding is April 25th so if you need any more information just send me a private message and I'll be happy to send you any specific information that I have received.
Best Wishes to you!