Good productive beach access for salmon can be a little tough on the Rock. Personally I would try Fay Bainbridge early or late for incoming silvers. Although Skiff Point can be good on a high tide, I don't really know about access these days. Of course, just off island Agate Pass, Old Man House and Suguamish are also possibilities. But better yet you might want keep going and try the Hood Canal/Salsbury Point area near Port Gamble or Pt. No Pt. further north. If you don't mind getting off the rock I will be happy to recommend a couple of other good lesser known spots if you PM me (bankies only please).

Good luck and don't leave home without it (your fly rod that is ;\) ).
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Matt. 8:27   The men were amazed and asked, “What kind of man is this? Even the winds and the waves obey him!”