Snow Lake is one of my favorite hikes near Seattle. It is less than one hour drive from Greater Seattle area (exit 52 on I-90) and is stunning. Hike up in summer is around one hour only and the view completely worth it. In winter, depending on amount of snow and if hiking without snowshoes, it can take even four - five hours to get up there, but going down in that case is blast. You just roll down. Watch out for avalanches in winter. I haven't encountered one ever, but people say it does happen.