Check into the go Boston card. It has a lot of the local destinations at a discount including the harbor tour if you're planning on seeing everything.https://www.smartdestinations.com/boston-attractions-and-tours/_d_Bos-p1.html?pass=Bos_Prod_Go&allInc=true&gclid=CjwKCAiAv9riBRANEiwA9Dqv1WhdFYpj2eBPEWXUt-Hix-fAtJF7DaUlVd38s-HBrEX8YCZbJGHzjBoC6ycQAvD_BwE
All prices r online
It depends, as you can choose between 7 different harbor cruises which are offered. For example, the costs (rates) in 2018 for the "Historic Sightseeing Cruise" were: per adult 32.95 $ per child (3-11years) 28.95 $ For more information, directly contact the tour company or check the according webpage: https://www.bostonharborcruises.com/harbor-cruises/historic-sightseeing-cruise#schedule-and-rates
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