My favorite of the free breakfasts is Carousel, which is also my favorite hotel along Harbor.
Carousel serves toast w/butter and jelly, instant oatmeal, danish, muffins, fruit (usually apples and oranges), coffee, and juice. I like that oatmeal and fruit are always available.
Tropicana services danish, muffins, coffee and juice. Milk, cereal, and bagels are available for $1 each (so milk and cereal would be $2).
Desert Inn has danish, toast, coffee and juice. Sometimes they have also had apples.
Del Sol has toast, danish, coffee, juice, milk and cereal. However I have not stayed here since it changed over to the Del Sol, it was Best Inn when I was there so the breakfast may have changed.
When I stayed at Fairfield if you selected a room rate that included breakfast you would get an Egg McMuffin from McDonald's. That was many years ago though. I think they now offer their own with the typical danish and coffee.
Ho Jo does not have a breakfast. I have not stayed at BW Park Place but I've heard that you could either get the typical continental or get pancakes at the connecting restaurant. I have not stayed at any of the other hotels.