Nice photos. That country is truly spectacular. If you go out there again, go all the way out to Cold Bay, refuel there, then do a circumnavigation of Unimak Island....that is truly Never Never Land out there!
Be careful flying around walrus.....if they bolt, and there are witnesses, you may get a serious visit from the feds......a good friend got caught on that once. Talked his way out of it, but it was pretty intense for a while.
The problem with walrus is they may not react at all once, twice or ten times, but the next time you just fly by, they may panic, and then it gets ugly....bulls stampede and trample cows/calves, etc. Mortality on one of those deals can be high, hence the sensitivity.
And, just to be picky

It's Becharof Lake....and a beautiful place it is...
I worked out of Cold Bay for three years.....amazing country. Looks like you had REALLY good weather.
MTV