|This is the public stairs you will look for from offshore
This is a google images snapshot of popular Fisherman Bay on Lopez Island. The red dot locates where the public stairs and beach are located. The village is adjacent to the stairs so you can get ice cream and fudge with minimal effort. The grocery store is about a one block walk. Btw, only fifty yards from the stairs is the public restroom with a donations only hot and cold shower. Suggested donation is $2, and there is no timer, now how cool is that?
If you have a navigation chart, you will find the stairs is almost directly opposite the red dolphin nav. aid marking the submerged spit at the bay entrance. (this means you will drive your boat within a couple hundred feet of the stairs, you cant miss em.)
I said there were two access points, the other is south of the red dot about 1-2 blocks, its a low bank off a gravel parking lot with no signs. The stretch between the two accesses is not public beach ( see comments) but I would simply go right to the metal stairway pull my dinghy up and tie it to one of the galvanized legs.