In addition to Rodeo Drive, you might want to look at Melrose and/or Fairfax. Melrose is divided into chic-y west Melrose (Maxfield, Fred Segal, Costume National, etc...) and gritty east Melrose (Sportie LA, a plethora of vintage and bondage shops). Fairfax has classic deli eats at Canters. Of course, 3 hours in LA is nearly no time at all, given that it takes about 20 minutes to get anywhere... and that's if you know the place. If you're into celebrity sighting, the stores on Robertson (LA, not Beverly Hills.) and the Beverly Center are better than usual bets. I've seen Jessica Biel at the Bev couple of times, and Tim Allen. And I've seen Juliana Margulies at Lisa Kline Men.