Local beaches and coastline
Walking the Pembrokeshire coastal path
"Wales' first long-distance route, the Pembrokeshire Coast Path National Trail covers 299km (186 miles) of the most spectacular coastal scenery in Britain. Opened in 1970
it's one of 15 premier long-distance National Trails in England and Wales, all waymarked by the acorn symbol."
Pembrokeshire Coast National Park Authority
Abereiddi

Abereiddi is a beautiful black sand/pebble cove, framed by rugged slate cliffs. There is a great walk from Abereiddi to Porthgain, be sure to check out the blue lagoon and some ruins along the way. It takes about an hour and the Sloop Inn (Porthgain) offers weary walkers a place to rest their feet.
Whitesands

Whitesands lives up to it's name! The beach is long, so never feels overcrowded although the carpark can get full during the summer months.
Other beaches
Pembrokeshire has many other exceptional beaches, including: abermawr, aberbach.
http://www.pbase.com/abwhitt/pembrokeshire