No overnight parking at Sanibel Causeway. Very nice for a daysail.
The ramp adjacent to the causeway permits trailers overnight for a price but I don't know about launching and retrieval. It is an awfully busy ramp and holding up a whole line of fishermen is not something I'd care to do.
http://www.leeparks.org/facility-info/facility-details.cfm?Project_Num=0062The causeway beach in question is the spoil island at the top of the picture near the foot of the bridge. I think of it as home.
The panoramic view is very nice. FWIW, as a New Year's resolution I've promised to launch from that beach every time I hear about a blizzard somewhere in snow country. I'll post pictures. Cheers!