Dee, did your kit from Costco have a restaurant guide in it somewhere? The colored plans did back in the olden days.
(running back in with Purple book)
It looks like the Purple plan, which has fish as an 8 oz serving, considers any Red Lobster broiled fish to be a protein serving. Ditto for a broiled lobster tail. A shirimp cocktail with 6 shrimp is a half a protein serving, and a garden salad is two vegetable servings. I would think you could ask for some sort of light dressing---it has been a while since I've been to Red Lobster, so I can't remember if they have some light offerings.
This is a 2005 plan, so Red Lobster might have some more exciting choices. You might see if they have an online menu with calorie and fat counts that you consider to be sensible.