Robin Hoods Bay is good rough ground fishing. The danger is the same as any other rock marks. You've got to watch the incoming tide, know exactly what time the tides are. Don't fish the marks in big seas, and never go alone.
Apart from all that it can produce, even in the summer. Boggle Hole a mark about a mile or so south of Robin Hoods bay also fishes well. They are all fairly rough marks, so simple rigs with rotten bottoms are best.
Check out the venue at low water before you start fishing that way you'll see all the gullies, and may be from up on the cliff, you'll get a better idea.
If you don't fancy that there's always the sea wall at Robin Hoods Bay. I havn't fished from it, but people do.
There's many good rough ground marks in the area. Saltwick Bay to the east of Whitby is a noted one, and some friends of mine have had some good wrasse from Gristhorpe, between Scarborough and Filey.
Is this any good?