I'm with
@spiderbait on the bear thing. But I'll also say, speaking as someone who lives and works in a suburb with some (black) bears hanging around . . . look, mostly they're not that aggro. If you run into a bear and be cool, you can go your way and they'll go theirs unless they happen to be in a
really bad mood or something. It's just if you're both aware of each other and they head straight for you that you have to worry about trying to intimidate a black bear or playing dead with a grizzly. Of course, wilderness bears might be a bit less used to people than suburban ones, but every time I or my wife have come across a bear it was like "Oh, huh, a human. Whatever."
Also, an extra tip: If you see a bear and it sees you, don't look straight at it. Apparently most predatory animals look in the direction they're intending to go. If you're looking it straight in the eye, to it that means you are about to head straight for it and it might not be best pleased about that.
And one more thing: If a bear looks like it's about to rough you up, try to remember if you're carrying any snacks. If you are, dump 'em; if you're lucky it smelled those and it wants them more than you.