I am visiting Boston from SF for 3 days and need some recommendations on where to eat. I am staying in the back bay area. I am interested in all foods from upscale to hole-in-the-wall regional, but do not want to venture out to the nether regions later at night as I will be a single diner. Anything not-to-miss? Great places to eat at the bar? I'm also always on the lookout for a good cup of coffee to get going in the morning (NOT a chain). Thanks for any help!