Go Fish is located just off the entrance of Granville Island (by the docks) and it is quite easy to spot the small blue shack sitting by the water. Their menu has soups, sandwiches, fish & chips (of course!), fish tacos and daily specials which are listed on a chalkboard. The prices listed also include the HST.
Go Fish - Pick-up window
There were quite a few people there that day. Good thing that the line wasn't too long. :)
I've heard that the line could stretch out down the pathway by the water.