Laugharne's literary associations run deep, and the reading that rewards a visit here goes well beyond Thomas's own work.
Under Milk Wood by Dylan Thomas is the obvious starting point — a radio play set in the fictional Welsh town of Llareggub (read backwards), modelled closely on Laugharne. Thomas's voice, if you can find a recording of him reading it, is as much a part of the experience as the text. The published play is short; read it before you arrive.
The Collected Poems of Dylan Thomas — the 1952 edition that Thomas compiled himself — contains "Fern Hill," "Do Not Go Gentle into That Good Night," and "And Death Shall Have No Dominion." These are the poems most closely associated with his Welsh life and worth reading aloud, preferably near the estuary.
Dylan Thomas: A New Life by Andrew Lycett (2003) is the best modern biography — comprehensive, honest about Thomas's considerable faults as a husband and borrower of money, and good on the Laugharne years specifically.
Portrait of the Artist as a Young Dog by Dylan Thomas is his autobiographical short stories about growing up in south Wales — funnier and more playful than the poems, and good evidence of what kind of company Thomas was when he wasn't destroying himself.