What do you get the Carmarthenite who has everything? A Rhod Gilbert DVD set or Elis James book, Holy Vible would go down well with the fan who shares the town's unique sense of humour.
Gifts from or of the old town may go down well...
Megan Tucker's lovely illustrated maps are available in Welsh or English here: https://www.megantuckerillustration.co.uk/collections/prints?page=5
With the map inspiring a hike, then some local food and drink might usefully go into a hamper gift. There's locally brewed craft beer:
Wonderful local cheese:
With a slice or two of Carmarthen's very own ham - allegedly the precursor to Parma ham, so legend says...
And then for something to read, with all this drinking and munching, why not dip into this book, available in Welsh or English and featuring the effigy of Sir Rhys Thomas, which is in St Peter's Church, Carmarthen.