Liz P.
Yelp
This was a cool place to explore, but don't budget spending a lot of time here, as it's basically one big exhibition.
To get here, you can either walk up (if you live or are in East Boston) OR you can go to the "regular" ICA across the harbor, then take the water ferry, which is what we did (boat ride, bonus! I love boat rides). Once you exit the ferry, there aren't a ton of signs that I saw, but you'll want to head to the right (east?) and then keep walking until you hit the Watershed.
The exhibit they have there right now was something to simulate being on a ship / in the water, I think, and it was very pretty. I think overall we only spent like 15-30 minutes here total though.
For the ferry, you'll also want to get there about 20-30 minutes before boarding, as people will line up beforehand - if not, you may have to wait an hour for the next boat.