1 day in DL from LA transport

[queenarmadillo]

As part of a planned trip to LA (Hollywood area) in July, I have managed (just about) to persuade my traveling partner to join me on a one day pilgrimage to Disneyland. I really want to be there for opening to make the most of the morning before the rush starts. Ideally I don't want to rent a car, so was wondering if anyone knows of any shuttles or trains running from that area that would get us to the park for opening (and be willing to take us back again after closing)?