I mean, it's itty-bitty--not going on & on like Long Beach Island. Most of Puget Sound's shoreline is rocky or just soil, not sand (think the coast of Maine). Ballard has a 2-mile-long stretch of beach called Golden Gardens that's pretty nice; West Seattle has Alki Beach, which is bigger but seems less like a beach to me.

Both ARE clean--you're more likely to see an otter than a condom.