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Squaxin Island is also patrolled by a small tug boat 24/7, and aside from the Museum, general access is not allowed.
So what's hidden on the island?
Mostly it's granted government land that they are not allowed to develop on. Elders of the tribe have a few mansions on the island, but I remember hearing that they're more like vacation homes, and most have additional mansions on the mainland.
There is a LOT of money granted to Natives in WA, and they are able to specialize their industry in "illegal" trades, like gambling, fireworks, firearms, etc. because they are not held to all of the same state/county laws.
>TL;DR
Injuns get drunk and trash this island like anywhere else they own.