Although the town lacks an abundance of tourist attractions, if your journey takes you past then consider taking a break here. There are some pleasant cafes, and the old town center and its famous market are definitely worth a look. A twelfth century history book names the town as the birth place of the wizard of Arthurian legend, Merlin. Consequently, there are a few 'Merlin' themed events and establishments in the town.
From East: M4 to end, A48 the rest of the way. Parking is not exactly easy, though the parking lot behind the market is the most convenient for the shopping center.
The town center is small enough to easily get around on foot or bicycle.
There are some good B&Bs in a rural setting near Carmarthen.
Camping & Caravan site