A cool little fishery that I took up a couple years ago to pass the time when salmon/steelhead fishin wasn't happening.
Like the other fellas mentioned, there are a couple of basic things to pay attention to and if these things are done, a bucket full of the little critters is not hard to come by.
Some may disagree, but here is what I have learned:
1) All the baits previously mentioned work but I think sandshrimp are the most consistent for getting bites every trip. If rigged properly (I use an egg loop on a #4 octopus gammie hook) the shrimp will only come off from a bite. I consistently get 10 or so casts out of them if they aren't bitten. By then, it's time for a new bait anyway.
2) I've caught them at different parts of the tide but without a doubt, I have done best an hour before, during and after low tide. When fishing low tide, I also look for depressions in the beach and once fish are located, I usually don't have to move to far. I think low tide "bunches them up" a little and they don't seem to scatter as much as on a high tide.
3) You don't need heavy gear. I typically use my 9 1/2 foot steelhead spinning rod with a cheap k-mart spinning reel that I don't have to worry about saltwater ruining. 8 lb. test, 1-2 oz. cannonball sinker and your favorite bait. It's easy to feel the bites and you can actually have fun playing them.....especially with a double.
I mainly fish Grayland but have caught them up and down the coast.
Good luck