Keep the centre plan small
The Castle Quarter includes High Street, Duke Street and Castle arcades; the Royal and Morgan arcades form another cluster. Browse independent shops, compare a few discoveries and pause for coffee. Meeting at a named arcade entrance is more practical than an open-ended instruction to meet in the centre.
Give the Bay its own outing
Wales Millennium Centre, Mermaid Quay and the Bay’s waterfront provide a different cultural-and-food combination. Choose an actual performance or an unhurried walk, then build around it. Confirm the programme and your journey between the centre and the Bay rather than assuming they are the same meeting area.