Looks like a great adventure to me. I grew up in the Northwest and had never heard of the place.
If you have camping equipment, your only costs should be travel and food (and I do hope you eat healthier stuff than the guys who made the video eat). Bears are probably only a problem around campground and in areas where people go a lot. Bers further from campgrounds are less used to people and less likely to be a problem. That said, I would still take the suggested precautions.
In my many years of hiking in the Northwest, I've only come across three bears. All turned and ran. But that doesn't mean they won't putter around in your camp at night. Though I never had that problem. Except when hiking along the Appalachian trail. Far, far away.
The one thing I'd check on is marijuana growers. They are rampant in that region of California, and it helps to know the rules, written and unwritten. I know that the Forest Service in that area has literature that says specifically that if you come across a cultivated marijuana field, first you speak up very loudly and say that you are hikers and that you are leaving, and then you add that you will not report the find. And the literature asks you not to report it. That unwritten agreement between the growers and the Forest Service/hikers has kept the peace in the area for a couple of decades. Just be aware.
Needless to say, taking free samples is discouraged.
I'm not kidding about this. Google it and you will see numerous stories on the subject. But I'm guessing if you stay as close to the beach as possible, you'll probably not see anything like that. The bad guys are probably a little bit more out of the way.
The coast in that region has amazingly consistent weather. Highs in the 50's every day in the winter, highs in the 60's, low 70's often in the summer. So it is seldom cold, and seldom warm, but it sure can get wet. And hiking through the rain through wet brush and moss and mud, while adventurous, can cause a person to wonder about their sanity. And maybe make them think about smoking certain varieties of herbs. Just sayin'.
Oh yea, and I don't know where you live, but the coast is famous for its huge slimy slugs. Don't step on them. Both for their sake and so that you don't have slug goo on the bottom of your shoes for the rest of the trip. It is almost impossible to clean the gooey stuff they are made out of off of anything. And too, building campfires can be real hard when everything is soaking wet. Its possible, but you need to know how. Carry stoves for cooking just in case that is a problem.
But do it and tell us how it went. Those of us with our butts glued to the chair in front of our computer screen want to know. Especially about the pot growing bears.