At the Greenway the canal was finished up to about the first lock at Ingliss. You would spend the night in the canal near the bridge. (US 41) If you pick up the channel from the Gulf the canal to the power plant goes off to the right and the channel to the Withlacoochie goes off to the left. Probably two to three miles closer to the open gulf than the river.
Check your charts, it's well marked but there is quite a lot of skinny water. They didn't put the daymarks close together because they had extra posts to use up . (:-)