I have to put in a vote for the River Pub Burger or Cancun Rob's, they come on an awesome bun, they are huge, and at robs you can get pico cooked right into the patty.
The Tap Room, by far. They are up there with Casino El Camino and the Jackalope in Austin.
One of the problems with Grins is that they only serve 3 drinks per person. Always. I can walk there in less than 5 minutes. There's no reason for the limit.