I just got back from the Mark Hopkins. I thought the food in the lounge was good, but the selection very poor. They had no warm food in the morning, just pastries, fruit, toast, bagels meats, cheeses etc. They had petit fours (finger sandwiches) at 3pm which were very good. They then had drinks and appetizers from 5:30-7:30. Just soft drinks after 7:30pm. They also don't have much food after 8pm. If you are going to use the internet the lounge might be a good idea expecially if you are an ambassador and are doing it for your last day. I know for me $30 for 2 breakfasts, evening snacks and drinks, as well as 28 hours of internet, it was well worth it. Otherwise for $30 you are prolly better off upgrading to a rate that includes full breakfast at the top of the mark.
Just my 2 cents
Cheers
Timo