Judging by the choice of
Mavericks, Apple would want to use names of places in California with an attitude.
Mavericks is an extreme surfing spot, so I would make an educated guess that the next one would be something along those lines, in other words:
exciting.
That's what made me think of
Rubicon. As I mentioned, it's an "extreme" Jeep trail (the most successful have been driving the small Wrangler type, although some have tried Humvees - with varying degrees of success). Being a Jeep owner, we heard of "Jeep Jamborees", and
Rubicon was among the most challenging.
Anyway. I would try and think of places with that sort of reputation. There are some places even in Yosemite that could be possibilities - like
EL Capitan, or
Half Dome (yea, that's kind of a funny name in itself, but we all thought that of
iPad too).
edit: Meant Rubicon. Brain: corrupt sector. Retry. Anyway, I live near Rincon, so that's probably where it "just popped in" from.