We drove from Issaquah to try this museum out. We went on a Thursday since it was free this month. We were a bit disappointed. It was difficult to find - not a lot of signage. And parking was a bear. The only parking nearby was 1 hr only. The staff was very firendly and helpful. And if there was only more room - like twice the space - it would be worth it. It's packed into such a small area it's a bit overwhelming and the kids (two year old twins and a 4 year old) were bored quickly.
Pros: ideas for exhibits, friendly staff, nice promos
Cons: much too small, lack of parking, needs more signage
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