Definitely Trillium restaurant in Boston, but that’s probably obvious. Some slightly lesser known good beer bars: The Merchant, Tip Tap Room, Lulu’s in Allston, Brewer’s Fork (good beer and pizza), Five Horses and Elm Street Taproom in Davis Square. Lord Hobo’s bar is probably my 2nd favorite place (to trillium) for beer and food in the Boston area, although I’m not a big fan of Lord Hobo Brewery’s beer.
People on here will likely say Cambridge Brewing is a must-stop; while I wouldn’t agree with that, I think it’s at least worth a stop if in the Kendall square area.
Also Trillium, Night Shift, Castle Island, Aeronaut, and more have beer gardens open now in Boston. Here’s a summary:
https://www.boston.com/food/restaurants/2019/04/19/boston-beer-gardens-2019.
Almost all these places except the beer gardens are open almost all the time.
I’d also recommend going to Framingham to go to Exhibit A, Jack’s Abby, and Springdale breweries.