First time one week SEA

My husband and I are taking our adult daughters and their boyfriends to SEA for a week as a kind of sample to see what it is like. None of us have ever been. When we did this with Europe we spent 10 days and flew to a different city each day and were able to see quite a bit due to the availability of cheap flights. We are wondering if we would be able to do that in SEA. Due to everyone's work schedules we will only have a week round trip. I know this is not what most people prefer as far as slow travel and being able to imerse yourself in the culture, but it is what we can do for now and are trying to show them as much variety of cities and nature that is different than Europe and then they can decide for themselves where they would like to go back to and spend more time in the future.

We don't spend time in museums or hiking just for the sake of hiking but we are willing to walk quite a bit to see something worthwhile like a beautiful waterfall or whatever. Does anybody have a general itinerary they could suggest? To be clear, we don't mind not having a home base and taking all our stuff from one place to the next but we probably do need to start and end the trip in the same city so we can take advantage of the cheapest roundtrip flight to and from home.