It's starting to warm up and I'd like to take my 4 year old son out for some easy bluegill fishing.

If anyone knows of a decent lake in or around King County, I'd appreciate it

It's been years since I have been there, but Silver Lake in Pierce County might be worth a shot. If I remember right, there was a place to rent boats or fish from the dock. We caught over 100 pan fish in one weekend about 15 years ago! Think i migt take my son there and camp now that i think about it.