Headed to Boston? Info you can use!

On my recent search for things to do with the family while in town for the Boston Marathon I stumbled upon the GoCard. This thing seems like it has every family activity you can think of on here! 70 activities for one price, it seems so easy! We bought ours and it has already shipped. A free Boston travel guide comes with, and a few extras. Purchasing the GoCard gets you into these attractions (keep in mind some of them are closed in April - mostly the water related ones):

Bay State Cruise Company-Provincetown Ferry
Beantown Trolley Tour: City Place
Beantown Trolley Tour: Prudential
Boston Childrens Museum
Boston Duck Tours
Boston Harbor Cruises 45-Minute Constitution Cruise
Boston Movie Mile Walking Tour
Buckman Tavern
Cape Cod Canal Cruise
Cape Cod Central Railroad
Cape Cod Maritime Museum
Cape Cod Museum of Art
Cape Cod Museum of Natural History
Cape Cod Rail Trail Bike and Kayak Rental
Charles Riverboat Cruise
Concord Museum
Discover Plymouths History - A Walking Tour
Fenway Park Tour
Foxwoods Casino Tour
Franklin Park Zoo
Gibson House
Gray Line Tour - Cape Cod
Gray Line Tour - Fall Foliage
Gray Line Tour - New England Seacoast
Hancock Clarke House
Harvard Museum of Natural History
Heritage Museums & Gardens
Hy-Line Marthas Vineyard Ferry
Hy-Line Nantucket Ferry
Hyannisport Harbor Cruise
Ice Skating on Boston Common Frog Pond
Institute of Contemporary Art
Isabella Stewart Gardner Museum
Islander Touring Train
Jenney Grist Mill
John F. Kennedy Hyannis Museum
John F. Kennedy Presidential Library & Museum
Liberty Fleet Tall Ship Adventures
Liberty Ride
Louisa May Alcott Orchard House
MIT Museum
Mass Bay Lines Whale Watch
Munroe Tavern
Museum of Fine Arts
Museum of Science
Nantucket Historical Association Whaling Museum
New England Aquarium
Newport Cruise Company
Newport Mansions of the Preservation Society
Newport Vineyards
Old North Church
Old South Meeting House
Old Sturbridge Village
Otis House Museum
Paul Revere House
Peabody Essex Museum
Peabody Museum of Archaeology & Ethnology
Plimoth Plantation & Mayflower II
Salem Heritage Walk
Salem Witch Museum
Samuel Adams Brewery Tour
Sandwich Glass Museum
Seaport Express Water Ferry
Six Flags New England & Hurricane Harbor
TOMB Presented By 5WITS
The Freedom Trail Foundation Walking Tour
The House of the Seven Gables
The International Tennis Hall of Fame Museum
The Mary Baker Eddy Library/Mapparium
The Nichols House Museum
The Old Manse
The Old State House Museum
The Swan Boats of Boston
The USS Constitution Museum
Theater-on-Wheels Movie Tour
Wrentham Village Premium Outlets Tour

Here's the GoCard link for purchase and further review:
http://www.smartdestinations.com/boston-attractions-and-tours/_d_Bos-p1.html?pass=Bos_Prod_Go