If you been there already then you're already convinced, if not trust me.
Burgermaster
There is one right off 520 floating bridge--on the East side of the lake (the Bellevue Side) This is across the lake from the stadium. I know there is a campus location too. (the original I believe).
It's famous place. Old school drive-in where you eat in your car with a tray at the window.
Burgermaster Combo 1
Awesome Hamburger--can upgrade to Baconmaster too
Fries--can get onion rings too
Shake--get the blackberry. It is hands down the best milkshake I've ever had.
PS.
this is the kind of shake you drink through a straw. It takes a lot of effort to get the shake flowing--but gets easier as you eat. It's an actual milkshake not the "cup of ice-cream" that the the JCW lovers love.