Treehouse by the beach
I make the pilgrimage about once every three months for my King Jjjuliusss fix. Never stayed there, but it looks super nice.
If you're ever looking for better beer:
Widowmaker in Braintree, Long Live (Roxbury and Providence) have great stuff and fun taprooms. In addition, in some craft beer stores you could look for Little Willow.
I've enjoyed Widowmaker, especially since I can pick it up at my local package store. But I wouldn't call it a better beer :)