Here is the walk through on this. Not sure why Homer's task would be stuck.
1. Have beach/water expansions (2 plots) ( Homer triggers) ( Squidport Pt. 1 )
2. Purchase Squidport entrance ($4,500) ( Homer triggers) ( Squidport Pt. 2 )
3. Place boardwalk sections ( Homer triggers) ( Squidport Pt. 3 )
4. Homer swears at the ocean (12 hours) ( Homer triggers) ( Squidport Pt. 4 )
Here is the contact link. Good luck! :)
http://help.ea.com/en/contact-us/new/?product=the-simpsons-tapped-out