There were sea otters that swam within 50 feet of the shore last time I was there. I hope they didn't bother anyone and thus be forced to move. I enjoyed hearing them and see them play on the water to show off.
There is a bath house here which can be rented for events. I saw a wedding take place outside by the wooden area. With proper framing, it looks gorgeous and private.
Amplified music is not allowed. With that it's nice to hear the sounds of people playing beach volleyball, the kids playing in the playground nearby. Different groups of the population are here depending on the time of day. If you go in the evening, plenty of 20-30 somethings abound.
Anytime of the year, you get an amazing view of the Olympics in the horizon. On certain times, you can see the snow-caps of Mount Olympus in the background. In the foreground, you see the Puget Sound and occasional wind surfers. Other times you might catch a glimpse of the resident J or K pods (Orcas).
There are hiking trails and 2 different dog runs. In the north-end is a nature reserve where you can visit the ducks. There is a large field for kite flying and occasional pick-up games of Ultimate Frisbee. To the east, the BNSF train whizzes by.
All this and 15 minutes from downtown! Take 85th St. exit of I-5 and drive west until you get to the water.