Maybe I can help??

We drove to KSC for the July 1st launch this past summer. Yes, I said July first.

It is true to plan to arrive 2 hours or more prior to launch. The traffic was unbelievable! (but they moved it through fairly well.)
We parked in the lot and brought our cameras, blankets, applied sunscreen to our noses, and we were off. Once you are through security check you are free to roam the center. People were staking out spots 2 hours prior to the launch. We went with BIL and his wife and their 2 boys. SIL and I held the spots while the boys wandered. Then, we switched, and SIL and I wandered and picked up drinks and snacks.
It was very exciting up until they cancelled our launch.
The shuttle did finally go up on July 4th, but we weren't able to come back to watch it. If your launch gets scrubbed, they allow you to return for that launch whenever it happens to go.
Good luck! I would plan to arrive by 3:30- 3:45 just to be safe. Bring binoculars, cameras. I'm not sure which kind of ticket you purchased, but they do sell a more expensive option that takes you by bus from the main center where the masses are viewing the launch to an area closer with better viewing. We didn't opt to purchase that and I really think you'll be fine viewing it from the center. Let us know how it goes!

I never thought about the ear plugs, but they might come in handy!