There are basically two options:
1. Below 1300ft in the special flight rules area without a clearance, but sticking to common traffic procedures.
2. Or with a clearance along the Skyline Route up to 2000ft with altitudes assigned by ATC.
More info here:
http://www.faasafety.gov/files/gslac.../kneeboard.pdf
And you'll need the TAC as well.