Metrolink above and underground are the best modes of transportation. Subway doesn't go to Beverly Hills because BH residents lobbied against the metro extending that far. The reason? They didn't want poor people coming over and ruining their oasis. You can take the Rapid, but we have no idea where your hotel is and you have no idea where you're heading, so...
Well, I'm going to LA tomorrow, but I don't need to get to the place in BH until Monday. It's for the new weezer video and I'm getting more info tomorrow.