Oh, OK, I'll take a stab at it. I always hate to attempt to draw conclusions from a single distant photo. I didn't respond because I wasn't really certain about these, and I'm still not.
1. I'm not even certain about the Long-billed Dowitchers. They all have very light tails, which is instead a characteristic of a Short-billed Dowitcher. I don't know where on the map of Alaska you are, but range may be your best indicator. You simply can't use the bill length alone to tell them apart.
2. I see two birds whose backs look like Wilson's Snipes, but the bill is too short. Maybe pectoral sandpipers, but the bird looks slightly large.
3. There is one Tern, and you can't see either the face or the tail, but I'm guessing an Arctic Tern.
4. The fourth bird is also a bit of a puzzle. The size is just a tad smaller than the dowitchers, and it seems to have a plover shape, but none of the plovers have an all gray tail. The closest tail match is a Black-bellied Plover, but the body color is wrong. The body color is more like a golden plover, but the tail is wrong. The only shore bird that does have a gray tail is a Red Knot, but it also has a gray rump which this bird does not. So I'm just not sure about this one.
