Yes! It is basically a big highway with an incredible park in the middle of it. Super cool tunnels. However you do have to pay an admission. You will be better off buying the year pass and going to Bryce and a few others. Bryce is about 75 minutes up the road definitely worth doing both if you're going.
Yes! And this is one of the coolest things about Zion because the drives through are stunning. Entering from the East is the way to go. You drop down into the canyon through a tunnel and winding switchbacks. On the way be sure to stop at the canyon overlook for a spectacular view.
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