The park is nice, some things to consider, the water only gets to 40’ deep at the farthest point and if you want to see the whole thing it is a long surface swim to get out there. On the plus side the fish (link cod?) are huge and are well over 4’ long and the park covers a large area. You just follow the paths through the park and they have set up alot of stuff along the way.
Another thing you might want to look into since you are in that area is finding a good octipi spot since Puget Sound is known for the largest octipi in the world.