I would highly recommend the tour of Liverpools first dock to visitors and residents alike.
It's free, which is always a bonus
, and really interesting.
You meet up with two archaeologists in the Albert dock, and they take you on the tour.
You get to learn what the line of fountains, and all the markings on the pavement by Liverpool 1, are about.
Then you get to go underneath the porthole/viewing window, into the dock itself.
Been on it myself once; will deffo be going on it again Liverpools first dock tour.