In relation to your first proven marketing idea I want to add some intresting tips:
Site gives you the opportunity to generate a constant and uninterrupted leads flow and future customers(according to Business Insider statistics, 83% of restaurants guests are looking for information about the restaurant on the Internet.
You can read an article about the restaurant's site: the features of this site,issues, design, the price and opportunities that open up for the restaurant business through the site http://merehead.com/blog/much-restaurant-website-cost/
. Also you can read about content posting in social media as way to keep users attention to your restaurant.