Casual is cool. Really cool spot just to drink and listen to good tunes is actually in Ala Moana Shopping Center on the top floor right next to Bubba Gump Srimp Co. called "Mai Tai Bar". Hot ass local chicks.

As for clubs, theres the "Ocean Club" - (Oceans) and umm.. fuck.. theres the Buddha bar and an underground bar .. the red lion or red square.. I dunno, but ultimate dive bar.. Hard rock usually has a club thing, but as for local? Mai tai bar with local live music, late night happy hour (I think its 5 dolla pitchas, one for each hand) and SEXY local girls minus bras.

Flip flops - shorts and a decent tee.