Opa! 325 Main St, Los Altos, CA94022 With locations in Los Altos, Los Gatos, Walnut Creek and San Jose, Opa! specializes in Greek cuisine. The Los Altos…More location is open for lunch and dinner every day. Separate menus are available for lunch, dinner, weekend brunch, desserts, cocktails and drinks. Choice selections include horiatiki, beef souvlaki, spanakopita, loukaniko, baklava, loukomades and Athenian breakfast pita. Online orders are accepted and catering services are available.