Well, if you want the 300 renown points for the mission, just hang around in the marked area for the five days, then drop over to Tulagi and re-fuel and go off and do something else, or do a Status Update. You can't do the status update though, until you have completed the current assignment.
Now, what boat are you driving, and where did you depart from !!HansGruber!! - Brisbane?? That assignment should have been out of the pool after January '43. I have the date somewhere of when the "pincers" closed and the US found that the Japanese were gone... Feb 9th was when it was declared secure, so that mission should have been removed by then. We'll take care of that immediately if not sooner... Thanks for the report!