We actually changed from the Back Bay to the Beacon Hill Tour.
The tour was fantastic, a nice number of people on the tour meant everyone received individual attention. Saba was lovely and friendly and took us around the beautiful Beacon Hill area. She is very knowledgeable and enthusiastic and full of historical information and ideas for good photo opportunities. Compared to other photowalks I have been on this was by far the best due to the involvement of Saba and the excellent mix between learning about the area and taking some lovely photos to remember our trip. Highly recommended.
Very good value for money. The museum of fine arts is excellent and the ticket is valid for I believe 7 days so you can go back. Late openings for the museum some evenings too, The Skywalk also has an interesting exhibition about immigration. The aquarium is definitely worth a visit and the city pass saves loads of money!