Culver's is great!
For ice cream, their flavor of the day is my favorite option, because they often have good extras added in which may not be in the menu.
Some folks like the "concrete mixers" for their ice cream, like more of a milkshake, but I find that the blending basically pulverizes any brownie or cookie dough chunks etc which I'd normally like to bite into separately.
So, I recommend the Flavor of the Day as a single scoop. That's my favorite!
Also, gluten free options are great! You can order any burger as gluten free, for a small $1-$2 fee. The gluten free buns come in a bag on the side, and the burger comes in the box (but without any buns on it). You can open the box, add the bottom bun, close the box, flip the box over, then open the box and add the top bun without a huge mess that way.
It works great every time!