what was their food habit like?
The south Coast Salish may have had more vegetables and land game than people farther north or among other peoples on the outer coast. Salmon and other fish were staples
Coast Salish
Anthropogenic grasslands were maintained. The south Coast Salish may have had more vegetables and land game than people farther north or among other peoples on the outer coast. Salmon and other fish were staples; see Coast Salish people and salmon. 
what is the geographical location of arlington? In northern Snohomish County, Washington, United States, part of the Seattle metropolitan area from where did the first place get its name? It has a disputed meaning with unclear origins with claims that it meant "lowland people" how is the climate like in the former place we talked about? Dry summers and mild, rainy winters moderated by a marine influence from the Pacific Ocean when was this place explored? 1851 who were the inhabitants during this time? Indigenous Coast Salish peoples name one festival of this area? Annual "Arlington Fly-In" air show one park? County Charm Park and Conservation Area what is the above show about? An annual airshow where thousands of general aviation pilots fly in from around the country showing their aircraft for judging what were the beliefs of the inhabitants you mentioned above? Guardian spirits and shapeshifting or transformation between human and animal spirits
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Coast Salish [SEP] Diet
Provisionally, this is primarily southern Coast Salish, though much is in common with Coast Salish overall. Anthropogenic grasslands were maintained. The south Coast Salish may have had more vegetables and land game than people farther north or among other peoples on the outer coast. Salmon and other fish were staples; see Coast Salish people and salmon. There was "kakanee", a freshwater fish in the Lake Washington and Lake Sammamish watersheds. Shellfish were abundant. Butter clams, horse clams, and cockles were dried for trade. Hunting was specialized; professions were probably sea hunters, land hunters, fowlers. Water fowl were captured on moonless nights using strategic flares.