Watch out for rattlesnakes. Watch out for mountain lions. Don't panic about them. Just be smart. No one wants to get into a fight with a human, and you'll just about always be left alone unless you do something completely idiotic.
Lemme just talk about the two particular ones I mentioned.
A rattlesnake will generally just sit there when it sees you. If you begin to look threatening, it will flee so long as it's given the chance. Just don't corner it or step on it--that's when they bite. So watch where you're treading.
A mountain lion will generally run away as well when it sees you. If it so much as hesitates, make sure it knows you're dominant. Don't ever run away from an animal whose instincts are to chase prey. Yell, stomp, make a lot of noise. If you have a little kid (or a significant other), put him/her on your shoulders so you look like one big animal. If you have a jacket on, unzip it and spread it out to make yourself look wider. Just use your common sense about what makes you look more threatening and more "dominant" in general--and less like prey.
But this isn't likely to happen to you. You're human. No one wants to get involved with you.
I live in Simi Valley and our freeway is one of the ways to get from Ventura to Los Angeles or vice a versa. Every day some of the worst drivers in the world pass through here. sometimes it's faster just to drive the city streets not to mention less stressfull. Ahh the 118 fwy home of cellphone yappers, ladies putting on make up and people driving below the speed limit.I repeat VERY VERY BAD DRIVERS
As I mentioned elsewhere, it's real windy at the top so you better watch your step and brace yourself for the occasional gust of wind that appeared to reach 90mph. Otherwise you might get blown over and really hurt yourself or worse!