QUICK!!! Best private tour Cayman, Costa Maya, Cozumel?

[NeedSunshine!]

Hi

I have found out only 2 days before that I'm going on a Western Caribbean cruise!!! I'm TOTALLY excited, but I strongly believe in being informed and making wise choices. PLEASE HELP!!!!

I have learned that it is best to book private tours. Here's what I'm interested in doing from the short time I've been able to research:

GRAND CAYMAN:
Stingray city & Island Tour

COSTA MAYA:
Chacchoben ruins & party/drink at beach bars. (which is most fun?)

COZUMEL:
Chankanaab Park, dolphin swim & snorkel, maybe Mayan fronteir by horseback


Your recommendations for private, reliable, professional tours would be greatly recommended. I leave Sun 2/22!!!