Someone asked about how to delete the ports in another thread, so here's what I did:
If there is a houseboat attached, you delete that first in edit town mode.
Once deletes the boat. Twice deletes the boat platform and the lot attached to the port.
I just went in and... the easiest way
testingcheatsenabled true
enablelotlocking true
click on port in edit town mode
click on lock to unlock port
change from community lot to residential
return to edit town
bulldoze/delete lot
(I left behind an empty residential lot. This should keep sims from going there.)
enablelotlocking false
testingcheatsenabled false