I think its a tough one too! I am too sentimental to go without DH, especially for Baby’s “first” trip! However, teh price is awesome and you all will be going together again on February, so hmmm… I don’t think I am much of a help!
I will say this though about the “Grand Gathering” issue… I actually thought it had to be 9 people! I do think that the baby will count for dining purposes though, because I always had to count us as 5 rather than 4, even though my son was only 9 months at the time (in relation to booking dinner for just my immediate family not teh entire “gathering”)!
For Grand Gatherings they make you register and then you have a “guide” that walks you through all of your perks (which you actually have to pay to enjoy, for the most part).