No, there is no locker facility at Port Canaveral. Your options are to...
1) leave stuff in the trunk of your car,
2) ask Shirley at The Perfect Gift (<a href="mailto:snelsonbrown@aol.com"><font color=blue>snelsonbrown@aol.com</font></a>) if she could hold onto some stuff for a week.
3) go to Mail Boxes Etc. (<a href="http://www.mbe.com/usa/MBE1174.htm"><font color=blue>link</font></a>) and mail some stuff to yourself for pickup after the cruise.