BOS Tower is very dilligent in telling us when a tall ship is in the area, and they get A LOT of tall ships in the area. Most days approach will warn you when they clear you for the approach, when they hand you off to tower, then tower will warn you when you first check in, when they clear you to land, and sometimes before you cross the shore line. They take those things very seriously. And whatever you do, never never fly over the big green ship. They'll tell you that even more than will about a tall ship...it's a huge petrol tanker that comes into the port in the channel under the short final area...they'll vector you on 2 mile final if that's what it takes to keep you out from above the big boat that can erase downtown Boston.
Nothing beats turning final over a ship yard lined with war ships and ocean-going tankers and freighters. I love KBOS.