Kesley,
I'm getting married at Secrets Maroma in February, and it's owned by the same people as Dreams....I am also using the Ultimate Package, which includes cocktail hour, food, etc fo 20 people. The numbers I got from the Secrets WC show that any extra people over the 20, it's about $50 per person. But again, thats from Secrets, but I assume they would be similar. I'm not sure how to attach docuements here, but my WC provided me with an "Optional items" menu with all the pricing for those things. You might want to ask the Dreams WC for something like that to help you out. Good Luck with planning!