Locate the specific ROLL CALL thread for your ship's sailing and post it in there! Rule of thumb w/ tour shares: if you are starting a NEW THREAD for your tour share -- stop!
If you need help finding the specific ROLL CALL thread for your line, ship and sail date, please read What is a ROLL CALL and how do I find mine? at http://boards.cruisecritic.com/showthread.php?t=44773.
You will find the best response by posting in the ROLL CALL thread for your ship's sailing date -- these folks are sailing with you -- and may be just waiting for someone else to have a great idea for a tour!