The next SpaceX Dragon has been delivered to their horizontal integration facility at Launch Complex 40. Image source: NASA.
Click here to order tickets. You need to enter the date March 1, 2013 and the time 7:00 AM.
Below is an image of the KSCVC viewing location on NASA Causeway:
Original image source: Google Maps.
It's about four miles from the Causeway to LC-40.
The price of the ticket includes daily admission ($70 for adults) and the launch ($20 for adults). This does not include admission parking ($10 per car).
If you already have the annual Commander's Club pass, you need to call the Reservation Department at (866) 737-5235 to order launch tickets.
Keep in mind that you don't have to enter Kennedy Space Center to watch the launch. You can pull off the side of the road on the 528 Causeway (the Beachline) as it crosses the Banana River, or roadside on SR-401 north of Port Canaveral. Both offer prime views of LC-40 about twelve miles away.