I wasn't impressed with the Rock n Roll Hall of Fame when I was there in 97. However, the bat exhibit at the zoo forced me to watch them for almost an hour. At which point, my wife was getting pissed, but she lasted about 45 minutes watching. I've never seen an exhibit like it since, it was remarkable.
The Watermark Seafood Restaurant is in the Flats. It's known nationwide. All kinds of chicks in the Flats area.
There used to be a WWII submarine there, the USS Cod(?) that we went in as well, for free. They also had land based 40mm Bofors to sit on, and swivel/elevate, etc. I don't know if it's still there. That was adjacent to the HOF, on the East if my memory serves me correctly.
Just looked, it's still there and is now a National Historic Landmark. IIRC, this is one of the most "complete" WWII subs around. Most parts that have been replaced on it, have been from sister ships.