I recommend Berto's Night Life tour bus! Recently, my girlfriend and I took the tour bus as a way to get downtown and back without the worry of driving.
We got lucky and, prety much, had the bus to ourselves.
Great, friendly, laidback driver (owner)!
Recommend it to any group that requires a way downtown and wants to preflight and continue the party back home! Don't risk drinking and driving, take the party bus! You won't be disappointed.