Take the Green Line East (towards Norwalk) to the Blue Line (Rosa Parks at Imperial/Wilmington)
Take the Blue Line North (towards Downtown Los Angeles) to the Red Line (7th St./Metro Center/Julian Dixon)
Take the Red Line, towards North Hollywood
Exit Red Line at the "Hollywood and Highland" stop
Go out the Hollywood Blvd Exit, the Hollywood Roosevelt Hotel is across the street and to your right, ~1/2 block away
Take the Blue Line South to the Green Line (Rosa Parks at Imperial/Wilmington)
Take the Green Line West, towards LAX (Aviation Station)
Exit at Aviation Station and ride the shuttle back to LAX.
Trains run from 5am till Midnight, and the ride should cost less than $2.00 each way.
Please check the Metro Rail page for the latest timetables and fare information.
A general overview of the Metro Rail system is available here.
Other options include the Super Shuttle ($15.00) or special rates from Budget Rent a Car of Beverly Hills (800-729-7350 ext 162 offer code 84RHC for preferred service).