If someone really cares about getting an autograph they have every right to stand there looking silly with the children. Just don't be a jerk about it. Some parents use their kids for autographs and that is the same thing to me. They just avoid the shame of standing there begging someone younger than them for a second of their time.
Cam does not sign for every single person. On any given day there is 2-7 thousand people that would love to have a Cam Newton autograph. Waiting in the prime spots with nothing to do for hours helps your chances but it guarantees you nothing. I would gladly trade a signature to enjoy my day in the sun watching guys fight for their livelihood. Cam did say he prefers to sign for people that are excited, but don't make an ass of yourself.
In Gibbs Stadium Zod pointed out the prime Autograph side. This is true but in 2013 they taped off the best seats for "VIPs". There are still many good seats but the supply is much smaller than the demand. You must arrive early.
If you send your children into the fray, keep a close eye on them. Don't let them disrespect adults or other children. And don't let them get bullied. People go nuts for Autographs, my 5 year old was excited at first but soon became frightened. It can be a mele like that time Tom Cruise pulled that kid over a fence.
Watch your kids with the markers too. My 5 year old drew a line on her Panthers Jersey with a sharpie with all the pushing and shoving. Byron Bell took off his shoes to give to the kids and people started trying to push her out of the way. When she received the shoe she tried to put it on the ground because she is 5. So just keep an eye out for their behavior and safety.
Fair warning. Even the most excited kids lose interest during practice. If you are on the hill they will run around in packs like feral animals. Bringing a football or Frisbee to toss around is a great idea if they find some open space.
Some of the best days to go are during the rain. It's very relaxing. If you wear under armour type clothes then getting a little wet shouldn't bother you. Just leave the electronics in the car.
There are drinks and hot dogs on site. They are fairly low priced and fairly low quality. (relative to sporting events)
I would never recommend going to training camp with expectations for an autograph. There are just better ways to get them. Don't be the guy that drives 6 hours for an autograph and holds a grudge when you don't get one. Veterans sign the fewest autographs in my experience.
She got this for being polite and encouraging.