Tacoma Nature Center is a wonderful place to visit. It's a nature preserve within the city with 70-acres of wetland habitat. Our family enjoys walking the trails there. They have a newly-opened natural play area for children there called Discovery Pond which we hope to visit soon.
There is a trail that leads down near a highway overpass. The trail has a footbridge that goes over Snake Lake and beside the overpass. These pictures were taken from the bridge.