1. Keep it concealed.
2. If you need to go into a court house, you'll need to check your gun at the security station. They are required by law to provide a secure locker for you.
3. Leave it in the car if you need to go into a school. There is an exemption in the law for "lawful purposes"; if you want to be the test case I'll donate a few bucks.
4. You can't carry a longgarm concealed; handguns only.
That's about it. There are no laws in PA regarding the posting of "No Firearms" signs by private businesses. No restrictions on carrying a a place that serves alchohol. None of the restrictions many other states place on CCW holders.
As the Buck County Sheriff said when I picked up my last renewal "Keep it concealed, don't carry in a school. That's it."
Regarding your summer carry choice; carry with what you practice with, practice with what you carry. Nothing else matters.