You can ride up Ward Creek Boulevard (or drive) to the start or come in from the Tahoe Rim Trail to the south. Cross Ward Creek and start pedaling up, up, up. Great views of the surrounding mountains and Lake Tahoe from numerous locations.
When you get to Stanford Rock, take in the views and decide if you want to go back down the way you came up, or head down to complete the Stanford Loop, or take the Tahoe Rim Trail - Brockway Summit to Tahoe City that leads to Twin Peaks.
If you stay on the trail to Twin Peaks, you'll eventually hit the Pacific Crest Trail and have to turn around as no bikes are allowed. Just an FYI, there are a lot of steps on the descent to Ward Creek to complete the Stanford Loop.