Its a bit of a struggle at the moment but some good places to try soon would be the rocks at bull bay for wrasse, white beach for all sorts, same for Penmon quarry, the rocks around Moelfre usually produce at least Dogfish, Whiting and Dabs. A bit of a walk but a nice place to fish at low water is a mark called Caim. Most of these rock marks can show Mackerel as well as everything else come summer.
If you get near ABC tackle shop at Gallows point near Beaumaris, he sells a book, containing directions to lots of marks on Anglesey, its by L&m rigs, but if you want directions quickly, just pick a place and ask on here and you will always get a reply.
Good luck to you, let us know if you get out, how you got on.