Ibiza is the shit! It dwarfs Cancun,south beach,vegas,NYC, all at the same time! The baddest club there is Privilege, (it holds over 10,000 people). Privilege is good on Mondays(Manumission). Also good clubs are Amnesia, Pacha, and Cafe Del Mar.
Beaches are all topless, and the women are incredible. Best month to go is August. whoever hasn't been there and likes the night life is missing out. This place is unreal! expensive as shit though, but worth it.