For something basic, look no further than your local McD's.
This is the "Local" breakfast plate with eggs, Portuguese sausage, Spam, and rice. It comes like this:
Then you chop it all up and mix it together, and add Soy Sauce:
Pretty good if you want something quick, tasty and relatively cheap. Hawaiians love their Spam - I read that they consume 4 million cans per year, which comes out to about 12 cans per person per year. What I want to try and didn't, is the Spam musubi.

Another breakfast that I tried was the "Loco Moco". Also very simple: Eggs, hamburger patty, rice and gravy. Tasted a bit like having salisbury steak for breakfast - I suppose a lot depends on the gravy:
My favorite morning treat of all was the wonderful, fresh pineapple that is available everywere. I would buy some every day at the local ABC store, and savor the delicious, juicy chunks. It is so much a part of the diet and culture, that even McDonald's gives you a side of pineapple with every extra-value meal. It's like sunshine in your mouth!