Ryan's is very dependable and consistent. I am in Honolulu once per month, and I will have lunch at Ryan's at least twice during the week. The restaurant is very accessible, easy parking and we always have great service.
I found the Thai chicken sandwich ( a little spicy) to my favorite. I also like the chicken and pork lettuce cups. Both are great for lunch. My dining partners each time opt for the fish tacos and I have to admit they looked really good. I would suggest making Ryan's one of your spots. It's out of the toursit section and is more of Honolulu than other places in Waikiki.
Give this place a shot. One tip, I like dining at 12:30 or 1:00, and that's generally after the rush hour crowds and the place is very comfortable.