Restaurants Walnut Creek Mariachi Mexican Grill Opens in Countrywood Shopping Center in Walnut Creek August 14, 2015 11:30 am 2054 Treat Blvd, Walnut Creek A new restaurant called Mariachi Mexican Grill opened several months ago in the Countrywood Shopping Center in Walnut Creek where Una Mas used to be. Previous Post Friday Question of the Day - What is your Favorite Indian Restaurant? Next Post Generation of Dreams Playing at Lesher Center in Walnut Creek on Aug. 20th and 21st