My wife rode the pristine orange Twenty we have. If you look hard in the distance, it matches the color of the top of the 50th Anniversary Space Needle! My 11 year old loves this view of Seattle.
There are a ton of waterfront parks along the basically flat 5 mile or so route. Fun to stop and smell the salt water! Also, much of the route has dedicated "wheels" path, meaning bikes only have to content with skateboarders and roller skaters.
No ride to Alki would be complete without a stop at Pegasus Pizza, my vote for best pizza in Seattle!!