Return cruises (at least 2nd time) get a gold sign & sail card, a past guest party with free drinks, and a carnival pin. I don't know what you get after 2 cruises but will hopefully find out soon.
Renee - The better half of RobRen :-)
Carnival - Spirit: Alaska (August 8, 2007)
Carnival - Miracle: Exotic Western Caribbean (April 9, 2006)
Royal Caribbean - Explorer of the Seas: Eastern Caribbean (January 2005)