The way points of this bicycle route:
End of the "boardwalk" part of the I-90 bike path. Don't zig-zag to the right as you would to continue the trail to Factoria; instead turn left onto 118th Ave SE.
Catch the bike path heading north & uphill on the east side of the SR-405 on-ramp.
NASTY but short hill.
Cut through car dealer's parking lot.
Get on SR-520 bike path here