I want to go to Cayo Costa several times for full-day shelling while I'm in Sanibel. I understand from Captiva Cruises, that they will probably only run a couple of times during Memorial Week. I need to find an alternative way to get to Cayo for a day of shelling (A charter seems like a lot of $$$ since it's just me, so I'd prefer a shared cruise). Any ideas of companies to call?