I read about this on DailyCandy yesterday and had to make a post because I think it would be great to try. There is a company called Six Taste that is offerering walking food/booze tours of different spots in LA - most all in the Downtown locale. They take you to a number of spots, stopping for food and drink samplings along the way.
The tours take place every weekend (Fri-Sun) and range from $35 per person (for a Downtown bars tour) to $60 (for a 7-stop tour in Little Toyko). All food is included in the price and tours take around 2-3 hours.
You can also arrange for a private tour with an agenda of your choice, just need to contact them in advance to set up.
More info at http://www.sixtaste.com/
Six Taste. firstname.lastname@example.org. 1-888-313-0936