I will start by saying The Cowfish is one of my favorite spots in South Park - I've had nothing but great experiences here. Just recently went here over this past weekend and was blown away by yet again. The Cowfish has a HUGE selection of food - not just sushi. I've tried at least 5 rolls and all their Bento Boxes (highly recommend the Brento Box); all have been delicious. The burgers are to die for. The cocktails are also freakin' awesome. You can really tell they care about all the ingredients that go into each drink. I had the Bacon (something, something) cocktail and ended up having 3. Friends of mine tried just about every other cocktail on the menu, and were very pleased.
I would highly recommend the South Park location to anyone. If you want drinks, just apps, or a full dinner, this is definitely a go-to!