Okay, I agree that Old Country Buffet would scare me, too.

Been there. Love it.
I would say baked chicken or fish, lots of salad with lots of veggies but no cheese or croutons, might do the fresh veggies but you'll want to look close to see if they are drowned in butter. The soup could be okay, but might be heavy on sodium. Avoid the desserts at all costs.

Or if you don't avoid the dessert eat just a little tiny bit of it.
Or, you can eat what you want and just try to limit the portions, depending on what you are looking for. I've been known to have high days where I ate more than plan allows for a special occasion. Depends on if you want this to be a special occasion meal or not.
I would have to avoid the dessert today, because I would have no control at all. I know my weaknesses.

Good luck.