> you're willing to trade some security for speed
FWIW, last time I took the bike path off Barbur just past the Barbur/Naito split that puts you on SW 1st near Curry. I took 1st all the way to Harrison. After a quick right then left, I'm only 2 blocks from Waterfront Park. Maybe I just caught Harrison at a low traffic lull, but it was very easy and didn't seem dangerous.
I will definitely give Terwilliger a go, as well. I've been meaning to ride it for funzies anyway.