Thanks for all the great tips everyone. kate, I will definitely be following your advice.
Ally you are so right. If you don't ask you never know. So I called the Marriott Hotel and spoke to the concierge; I asked them a million and one questions about the breakfast, lunch and dinner menus. I also told the concierge of my dietary requirements and asked them if they could cater for my needs. Which they can woo hoo. So basically as long as I let them know before hand, everything should be fine.
With dinners I will stick to fish, steak, chicken dishes (without sauces, rice and pasta) and get a side serving of salad and vegetables. Lunches, I will stick with some fruit salad and salad sandwiches (no butter or mayo). Breakfast I can still have my porridge (yummo but have to remember to ask them to make it with water instead of milk) and snacks I will go to a woolies or coles and buy some nuts and zip locked bags to take with me to nibble on.
I'm glad I've got a plan down packed. Was a bit worried
but if I stick to my plan I shouldn't gain any weight. I will also have to watch my alcohol consumption