I'm vegetarian and Boston is always one of the cities that treats me RIGHT, so don't worry.  

If you're taking the train into or out of town, there is a great juice spot with vegetarian sandwiches immediately outside of Back Bay Station.  That place has seriously saved my life on occasion, though it's tiny and a bit difficult to get in & out of when there's a rush, especially with luggage.

There's a regular farmer's market in Copley Square.  I forget which days of the week, but nothing was ever cuter than strolling out into Copley Square in search of my morning cup of Earl Grey only to be surprised with an entire farmer's market waiting for me.  My clients and I all enjoyed fresh local fruits together that day and it was awesome!  

My favorite vegetarian spot in the downtown area is actually a vegan Thai restaurant.  I particularly loved their coconut flesh curry simmered in coconut milk, but I'm not sure if it's always on the menu or if it's just a special that they offer sometimes.  If you're a coconut fanatic like I am, it's worth asking them about it.

I've found most places in Boston have vegetarian options unlike a lot of other cities in the USA.  So you shouldn't have a difficult time finding something yummy to treat yourself with between all your hard work.  

Have fun on your tour!  

-- Modified on 9/20/2016 4:26:35 AM