What's good about the Western Caribbean Itinerary
You're on the ship for 7 nights - it doesn't get much better than that!!!
Here's my take on the western cruise as opposed to a prior poster that stated:
KW: eat and shop
GC: eat and shop
Coz: eat and shop
Me, I never have figured out why in the world do I want to go to the caribbean and then go shopping. I can shop at home any time I want to.
In Key West there's a great snorkeling trip out the the 3rd largest barrier reef in the world. And there are some very unique sights to see / visit in Key West proper.
Grand Cayman: some of the best snorkeling around - great reefs, lots of fish. And you can "snorkel" with the sting rays here too.
Cozumel: Some very good snorkeling and scuba excursions to do. Carlos and Charlies for a wild time (leave your inhibitions at the door). There are also many great beach destinations (Chakanaab, Mr. Sanchos, etc) with swiming / snorkeling opportunities, shows, other water sports and some pretty good food (or so I've heard).
Some people think that the "sea day, shore day, sea day, shore day, etc" is a great way to go since you're doing "something different" each day. Other people like the eastern because you have a couple of sea days in a row to really "get into your vacation" and then two shore days, sea day shore day done.
The western islands are "flat" islands (no "mountains") and on the eastern the islands are hillier (some would say mountainous) so the look of the islands is very different.
Its a matter of personal preference and what you want to do. We've done both and would do either again in an instant if $$$ wasn't an issue.