Not fished it myself recently but I'd imagine that there would be a few flounder (thin though!) around at St Ishmaels (by Ferryside?). Haven't heard of any bass caught there recently.
Have you thought of giving Llansteffan a go, fishing from low up, if your looking to come this way. In my view it is a better mark than St Ishmaels as you have access to the main channel when the tide is flooding.
Laugharne is another mark you could try, just a bit further round the coast.
Good luck, ATB
Dan