Sumo is by far the best sushi restaurant in Green Valley. I eat here 2-3 times a week, and it is always amazing. The staff is very fun and friendly, If you dont like fish, try the Sumo Special short ribs...Korean style beef dish that is awesome. Or if you like Tuna, ask for the cocaine at the sushi bar...its not on the menu, but they will no what you mean. This review has made me crave it...going there tonight. :)
Also, probably one of the largest sushi bars in the Green valley area. The sushi bar takes up the whole room, and there are only a few tables.
Also try Tuna Karai, baby tako sansai, Kamikaze roll...my Favs. And let me know what you think... :)
8/15/07 Ate here again last night, and had the Spicy garlic tuna sashimi....a new favorite. The spicy yellowtail rool was very good too.