Mini trip report:
1. Kartoffellkellar: Very good but crowded. Easy enough to find under the Holy-Ghost hospital. I had the coalfish/salmon on a bed of potatoes and veggies with a sharp horseradish sauce, along with a Duckstein.
2. Lück: I only found in one place serving it, in a little Kneipe off Königstrasse by the Haerder Center. The locals looked at me funny when I walked in and were standoffish until the resident big, friendly dog took a liking to me (then everything was OK). Kids and dogs seem to like me.
3. Boat Trip: I opted for the shorter, round the town boat trip. It was a very nice ride, with all commentary in German, but everything was pretty easy to understand. The day of the trip (Saturday) could not have been prettier.
I also had lunch in the Rathaushof, which has a fantastic view of the roof and twin spires of the largest church on the island. The food was excellent. I did not make it up to Travemünde. Also I had some time in Hamburg before my flight and visited the fish market (Sunday morning, live concerts and beer before noon in the warehouse

). Also did a harbor cruise with fascinating views of the container ship port.