Re the walrus hauling out on land. Prior to a series of over enthusiastic slaughterings, walrus were common in the Gulf of St Lawrence, as far south as the Gulf of Maine, they were present in Iceland and Norway and Scotland. All of these populations had to contend with at least seasonally ice free conditions.
These were populations of Atlantic Walri (Walruses?) rather than Pacific, so that may make a difference. I'm not familiar with the historic range of the Pacific Walrus, although a friend recently harvested one in the Yukon River in Alaska.
