There is simply too much available to do in the Boston area! When we previously went with our family of three, and used the Boston Go card, we found that it was a terrific deal and allowed us to take advantage of the many opportunities and sites. However, this trip we were travelling with a larger group and we found that the price of the individual admissions would have been much cheaper in the long run. My advice is that if you are traveling as a family, the Boston Go card is an easy and great bargain but if you are going with a group, you are better to simply pay-as-you-go. Groups apparently take longer to see the sites so you aren't able to see and participate in as many of the wonderful options that Boston has to offer. Also beware of the fact that many of the historical sites and other items are available free of charge or at very little cost. Boston is a great city if you want to take a very inexpensive sightseeing tour but the housing and food costs are at the other side of the extreme, so plan ahead by taking food with you, and considering staying outside Boston proper and using the subway which is easily navigable and cheap.