Port Williams is a boat launch just northeast of Sequim and just outside the mouth of Sequim Bay. It can provide access to several miles of beach both to the north and south and one can usually find cutthroat somewhere along there.
That's kind of rough boat launch there, more suitable for smaller trailered skiffs. It is not maintained, and is pretty slick. I wouldn't recommend launching a larger craft from there, like a cabin cruiser or anything very heavy. Car-toppers and kayaks, and smaller trailered rigs are more suited here. Larger boats can easily be launched at John Wayne Marina in Sequim Bay, which has some nice facilities, to boot.
The park at Port Williams has a couple of pit toilets. A couple of picnic tables. I can't remember if there is any potable water or faucets. I don't think so, since I always have rinsed my reel back at my rig with fresh water i've brought along, or dipped it in a nearby run-off trickle.
Its a nice little county park where locals like to walk their dogs up and down the beach. They carry doggy doo bags and scoop the turds, though, and there is hardly any litter along there. Its a nice beach for a mellow walk, unless you don't like dogs.
The beach is backed by high eroding clay banks to the NW. About 3/4 mile up that way, one encounters Grays Marsh Farm property which is posted No Trespassing.
To the SE, one walks about a mile to the mouth of the bay, and as you walk down the beach and eventually around into the entrance, you come to the outfall of the Bell Creek estuary lagoon, and beyond there the beach segues into marsh, and is posted No Trespassing, too. From there, you have to retrace your route back to the park.
The property above and beyond the berm along the beach to the SE of Port Williams is private, too. The entire marsh area surrounding the Bell Creek estuary is a private reserve, but you can walk the public beach down to where the Bell Creek lagoon empties in, which is right inside the mouth of the bay, after which the land is private and posted.
So you have about 3/4 mile of beach to the NW, and about 1 1/4 miles of beach to the SE to explore.
Its not the best or most consistent cutthroat fishing in the area, but my Dad lives a little over a mile from there, so its an easy hit when I'm up there for a visit.
We have to cut some slack in regards to the Ancient One's use of the term "several miles of beach."
I know how distances seem to get longer, as I grow older.