My coworker claimed that the bike/pedestrian trail leading from the Olympic Sculpture Park, then Myrtle Edwards Park, then Elliott Park would go all the way to Fisherman's Terminal.

Didn't quite.

Past Elliott Park, it goes through Magnolia Connector to Pier 84, then it goes through a very funky bypass along land owned by the Port of Seattle, along railroad tracks (trail was well marked and fenced, so it was safe but the view was very industrial), and ends up at Pier 91. There was a sign pointing to Fisherman's Terminal. I still had plenty of energy so I followed it. It turned into the Magnolia Bike Path. Not bad, but it was at least another mile crossing the Dravus Bridge, and another 1/2 mi further to Emerson. Crossing Emerson, it was another 1/4 mi to Fisherman's Terminal.

So I made it that far, but I can tell you from personal experience that its at least another 2 mi from the edge of Puget Sound Park System to Fisherman's Terminal. I figure all told it was about 6 mi.

Thinking about all of these superlong walks as urban hikes. I pick my destination, my rules are simple. If I see a sidewalk or stairs with railing I can walk it. When you think about it, while nature is beautiful and inspiring, if you need the physical challenge, why drive 50 miles to walk 10 miles? Why not walk the 10 miles from home?

So far I've found out:
-I have my choice of 3 direct routes to walk from work to home. (Aurora, Dexter, Westlake).
-I need a Sherpa to get to the top of Queen Anne Hill. Brutal for a hill. Phew!
-It takes only 1 hour 15 minutes to walk from home to University of Washington.
-It takes only 20 minutes to get to Green Lake and another hour ten to walk around it.
-Walking the Ballard Bridge is only slightly less scary than walking the Aurora Bridge.