I am planning a trip and need ideas of where to go and what to see in washington

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I am going to washington state for the first time, I will be driving from norther california to seattle, to visit friends for a few days then to just explore for a few days. So can anyone tell me some great places to go and see in seattle or along the way again from northern california rto seattle washington. this can includes, attractions, museums, places to stay the night, restaurants, stores, whatever i just want to have a good fun trip in case i never get to go back. P.S. trip will be approximatly two weeks long thankyou