Not to familiar with Malibu "nightlife." But daytime, a drive up/down PCH is a must! Some of the most beautiful views E-V-E-R! There is also the Adamson House, a state-owned museum that reveals early life in Malibu, CA.
Here's my tip: Wednesday nights, at the Cross Creek district, there's a fun 'karaoke night', with current hit records spun in between karaoke performances at the bar Café Habana (Cross Creek Rd. and PCH). The night gets going at about 9:30-10:00pm. Fun, fashion-forward locals, and occassional celebrities make for a great time. Have fun! : ) g