To answer Peggy's question regarding Crystal. This is how it works:

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Cruise Levels:

One cruise up to 24 days: Guests receive credit for one cruise level.
One cruise of 25 days or more: Guests receive credit for two cruise levels.
Cruise levels are posted at the conclusion of each cruise.
Cruise levels are cumulative, are not deducted after earned, and do not expire unless the program is discontinued.
Cruise levels are non-transferable, and are rewarded to the individual who sails and not the person who pays.
So, a cruiser that sails 15 seven day cruises gets credit for 15 cruises. A cruiser on world cruise gets credit for 2 cruises.