Re Liverpool - my hometown - I’d like to mention that art lovers shouldn’t miss the Tate Liverpool (Albert Dock area) and the Walker Art Gallery (opposite St George’s Hall).
In fact, I would suggest that when docking in Liverpool, it’s really worth spending the day there and not rushing off to Wales or elsewhere, even if you’re not a Beatles fan. There is so much to see.
For example, a walk along Hope Street https://theguideliverpool.com/can-we-talk-about-hope-street/ from the Catholic cathedral to the Anglican cathedral is really interesting. Beautiful Georgian architecture, a pub (the Philharmonic Dining Halls) with a renowned men’s bathroom, the Philharmonic Hall itself and you even pass my old school, Blackburne House, which I attended in the 1960s! There’s also a great view from the bell tower of the Anglican Cathedral. And good restaurants for lunch.
The Maritime Museum (also Albert Dock) is also definitely worth a visit and is home to the International Slavery Museum. Don’t forget, Liverpool was once the main slave trading port of Britain and many of its grand buildings stem from this period.
Just some suggestions…