Western excursion recommendations for kids ages 4,6 & 9

[PolyGirl]

After reading all of the Disney offered excursions for the Western cruise I'm confused on what's best suited for children.

I'm leaning towards renting a jeep in Cozumel and doing that on my own. But what about Grand Caymen and Key West. I've heard Grand Caymen beaches are fantastic so I'm not sure if I should just plan a beach day their.

Any suggestions???

Thanks!!!!!