Doug,
Nice Dowitcher and Sandpiper shots, but I prefer to shoot them in nice Golden Hour light when they really pop out against the darker color water at that time.
I had a great time in Alaska in Kenai National Park and Denali. Saw lots of bears,Dall sheep, moose, caribou, wolves, a porcupine, arctic hare, and a Ptarmigan in Denali. Saw bears,tufted and horned puffins,muirres, sea otters, stellar sea lions, rhino and parakeet auklets, oyster catchers, and humpbacks in the waters of Kenai Peninsula. Oh, and the famous bald eagle nest near the McDonalds in Homer with two baby eagles ready to fledge. We lucked out on the weather and got to see the complete Mt. Denali top to bottom for two consecutive days. The 2nd day the Mirror lake was perfectly calm and provided the perfect classic reflection shot of Denali of which I really hoped on getting. Saw a dead caribou in the river which the wolves had killed and stripped clean. Unfortunately, my wildlife shots are all with my 500L and thus I can not post them here. Forgot to mention that we saw a bear swimming in the ocean near shore and another bear on shore with two giant salmon in its mouth.
@Ajay, I have the APO 2x extender and it works very well with my 180/2.8 APO. Much better performance than the 2x Canon extender. Hope you find one soon!