Go to John Harvard bar in Harvard Sq, the oat (or oatmeal) stout they microbrew there is :tup:
And while you’re in Cambridge, go to a bar call Bukowski it’s on Cambridge St., to spin their beer wheel to decide what you want to drink. After midnight, their bar menu are all $5, so grab one of their specialty burgers (usually $9).
If you going to Sam Adams brewery, make sure you catch an early tour. It’ll probably be packed on the weekend. It’s also in a bad neighbourhood, and out of the way of the other places you’re seeing.
You can walk the Freedom Trail, and visit places dedicated to Paul Revere. Bunch of parks not far from Quincy market.
Fenway park may have tours if the Sox aren’t in town playing, if they are, they may still have tours.