Several Carnival ships have dance clubs that consistently rock. The Fascination dance club parties hard. The Glory's club will be up way past 3. When the Victory sailed out of NYC, it was a fun spot that played music more for the ears of the over 30 crowd.
I think the only dance club that was not consistent was the Destiny and that is because the DJ would change into long lapses of Salsa music on a dime which would kill the party atmosphere for all but the hispanic passengers.
(cruzin' solo by design)
Freedom ('09), Imagination ('08), Victory ('08), Destiny ('08), RCCL Navigator ('08), RCCL Majesty ('08), Glory ('07), Liberty ('07), Fantasy ('07), Destiny ('06), NCL PofAm ('05), Fascination ('04), Victory ('04), Fascination ('04), RCCL Voyager ('03), Fantasy ('99)