there is Heavy rainfall a lot of land and fish within the water streams to hunt. 

The gwaii spoke something similar the haida . 

 the Haida lived  In rectangular cedar-plank houses with bark wood roofs and they were up to 100 feet long.  all of the houses had  females from the same clan with as many as 50 people.  They  lived in the nearby forests and mountains  and they fished in the ocean and rivers, gathered berries and shellfish as well as other things, and harpooned large sea mammals such as sea lions and seals .

They were divided into raven and eagle that were different social groups and they were also called the Meiteis. They voted on things  to get consensus,  or if consensus could not  be reached the chiare would  cast the deciding vote.

They believed in a variety of supernatural beings, a belief in reincarnation, and the presence of shamans.  Raven and the first men depict the creation myth of the Haida people. 

"The Haida were feared along the coast because of their practice of making lightning raids against which their enemies had little defense. Their  great skills of seamanship, their superior craft and their relative protection from retaliation in their island fortress added to the aggressive posture of the Haida towards neighboring tribes."

(https://www.historymuseum.ca/cmc/exhibitions/aborig/haida/havwa01e.html)