If you want a fabulous buffet, go to Del Mar (HDR restaurant by Key Largo), $14 and it's all you can eat, 3 egg omelet, bacon, sausage, chicken in a light cream sauce and even a beef stroganoff, potatoes, rice n beans, plantains, toast, butter, jelly, cereal fruit oj, coffee, muffins...all you can down. it's pricey but if you're a big eater you get your money's worth....
From time to time Holiday Inn offers some reasonable brunch and it's cool to enjoy the view from the top floor, bring your favorite chica. Be careful, they'll try to get you to go with their menu and their regular food prices are astronomical, I would confirm with them first before you go there that they have a special, the view is fabulous...