Taken from
http://www.fishingireland.net/dublin/dnsea.htm
"North Beach at Greystones is renowned for its shore fishing for coalfish, codling, dogfish, dab, plaice and occasional turbot, sole and conger. At Greystones Harbour there is pier fishing for codling, small pollack and occasional bass. Rock fishing onto sand for codling, coalfish, whiting and plaice.
The South Beach, Greystones produces codling, pollack , dab, plaice and dogfish. Hotspots are opposite the outflow pipe on the “Hungry Acre” and around the stream at Ballygannon. There is easy access across the railway line at Kilcoole where codling, coalfish, dogfish, dab, whiting and plaice turn up in catches regularly."
Bait-wise, I have seen people digging th mud flats at Bray.