I only made one patrol to the East Coast, where I managed to find and sink only a couple of lone merchants (small coastal and a C2) around Boston - When I tried to head into NY I found nothing but tons of DDs and Elco/PT boats, eventually getting killed by some uber-early-radar-toting 4-stacker DD that somehow spotted me as soon as I surfaced at all-ahead-slow at 2am on a moonless night from 6,800m away
So much for the Second Happy Times
Now I'm on my second patrol in my Type IIA in October 1939, so it looks like it'll be a while before I get to see the East Coast again.