The decision to carry is one's own, I have carried a fire extinguisher in my vehicle for 30 years and have never needed it once, but I still choose to carry it. I have also stopped at a McDonalds for a quick meal once and had a nut with bugged out eyes pull a very large knife on myself and my family. In the last 20 years that is the only time I have needed to draw my weapon, but had I not had it I'm certain it would have not ended well. I did not fire, the threat of just seeing it and a few descriptive words with the guy were enough to convince him he would need life insurance if he did not back down.
As far as the legal tangled web goes, it can get very complicated. There is an excellent Android app called CCW. It costs very little, and is continuously updated with the latest facts. It has all the important things on the front page and all you need do is pull up the state, or even turn on the gps and it knows your state if you are on the edge and not sure. You can put your permit in the settings and it shows all the states your permit is good for, even if you put multiple permits in like a non resident permit to go along with your resident permit if you have more than one.
It tells you where it is illegal to carry and quotes the state law.
It tells you if it is a "must inform" state where you are required by law to tell an officer who pulls you over for a traffic violation that you are carrying before the conversation even gets started.
And pretty much anything else you need to know to keep you legal.
Each state law is different, I know many states have changed the law to allow for carry in State Parks.
The big one use to be the Army Corps of Engineer property since it is Federal Property. Half the campgrounds I would use are Army Corpse of Engineers. The laws are constantly changing, but last I heard a case was filed and it is now legal on Army Corpse of Engineers. A different ruling may come out later, but this is what I read recently.
I hope this information is useful to those who choose to carry for their family's protection.
Morris v. US Army Corps of Engineers, D. Idaho, Jan. 10, 2014. “The court strikes down the regulation on 2A grounds. The court reasons that the regulation affects the core Heller right of self-defense, and that possession in a tent is as protected as possession in a home, the regulation entirely forbids that, and therefore is subject to strict scrutiny. It reasons that possession for self-defense outside the tent is also protected. It reasons that a complete ban on that is a serious infringement, but it is not necessary to pick a standard of review since this would fail even intermediate review. It grants a preliminary injunction since plaintiffs have proven a ‘strong likelihood’ that they will win at trial.”