How do i Opt out of doing the Ships?
If you do not wish to participate in the ships and do not want any ships coming to your port you can do this with the 'Enable Ships' Preference.
Top right of your game screen, click on the icon that looks like a wrench/spanner. When you hover over the icon it will say "Preferences".
Scroll down to the bottom of the list and
remove the check mark for "Enable Ships" then click the green check mark to save.
When the "Ships" feature is disabled your seaport will not receive any more ships from other players and other players will not be able to load your ships.