Having the Go Boston passes was great! We passed ahead of the huge line ups at some attractions and it was so much easier than having to pay, just show your pass and go. It was really a great money saver too.
The card was very useful. it gains you entry to lots of attractions and is worth the money. The duck tour for me, was not as good as everyone raves about! maybe go whale watching instead. The aquarium is very good.
Although the Go Boston card has lots of options, it is difficult in the time you select to really take advantage of a lot of items. Most spots are only open till 5 or 6, which limits what you can do,. depending on how ou are making your way around town.