I liked Barclay Lake up by Stevens Pass. Fairly easy hike. I took my 5 yo on this one. There were logs at one end that got you out far enough to make casting easy. There are many others and I'm sure you will get many replies.

I do hate to disappoint you about one thing though, the Highway 2 & I-90 parking areas have received a lot of vandalism in recent years, so parking any vehicle overnight is questionable.