Buffalo is right... good suggestions & traffic is going to be a pain during those hours. You may also wanna try:
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Santa Monica Pier -
3rd Street Promenade (which is near Santa Monica Pier) Restaurants/bars/specialty & exotic shops/theaters/street entertainers, etc.
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Old Town Pasadena (on Colorado Blvd) Restaurant/bars/specialty & exotic shops/theaters/home & clothing shops, etc.
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Long Beach off of Pine Blvd (aka THE PIKE) ... keep going all the way towards the ocean... it's passing Ocean Blvd. Brand new shopping center/entertainment area. There's also a Hooters on Pine Blvd a little north of that shopping ctr. I've only driven by this one so excuse me if I'm wrong: theaters/restaurants/arcade/specialty shops
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Hermosa Beach Pier/Strand - Restaruants/bars/few shops/Beach access/Comedy Magic Club South on Hermosa Ave
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Venice Beach -
Getty Museum - They're open late, parking is $5, admission is free and there are AWESOME views!
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Melrose - Restaurants/bars/specialty & exotic shops/freaks
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Belmont Shore in Long Beach - Restaruants/Bars/specialty shops
You may also wanna try
LA Times for more info.
Is there anything specific you want to do?