Found this on WSF
"It's six and two threes as to park at craster or embleton, but to get to the mark go through the main gate which is on the craster side of the castle.
If you are polite and ask nicely the national trust bloke at the gate will let you through free if he knows you are fishing. Once in follow the wall to the right follow the path along the edge until you get to a little style at the far corner. Over here and you can fish any of the cliff edge to the left all the way down to sea level. The cliffs nearest you are pretty high so approach with caution. The mark is reasonably safe but the rocks can get slippy when wet so watch yourself around the edges.
The high part of the cliff is supposed to be good for pollock, just a short lob to the water below. The low part has a small rock that becomes uncovered at low tide, spin round the edges of this apparently.
The whole area is quite snaggy so rotten bottoms if you can. The water gets really deep, really quickly, so when you gear hits the water, remember to give plenty of line so it sinks straight down rather than pulling in towards you."
Embleton beach is an excellent mark for flounders and I normally fish low water where the river runs in, a bit further south towards the castle can produce decent turbot.
You can fish off the end of Craster north pier and you should catch small coalies and pollack on the float and there are flounders on the inside over high water.
There are plenty of low water rock marks just to the south of Craster and a bit further down is Cullernose point, for these you would need heavy duty gear.
Hope this helps