We have to go to Orillia this Saturday and would probably want to do lunch in or around town.
Is there anything that's not to be missed??
I lived there a while ago. Sadly, I am afraid most choices are chain restaurants. However, Duckworth's fish and chips opened up recently (8 mons?), it is midway between the casino and the main village. In complete honestly you are not going to get much better than that. If that doesn't sound like your cup of tea, I would go to the casino to eat.