I have two sons, one 26, one 22 and a daughter 12, almost 13. I wouldn't allow anyone of them to go off anywhere when they were that age. Especially nowadays with so many weird crazy people out there. My 12 is allowed to go to movies with friends but is dropped off and picked up and does not leave the building. You just can't be to careful.
My 22 yr old got into trouble when he was about 6 or 7 and screamed at me..."your a mean mom, a mean, mean mom". To which I answered, "Thats why I went to mean mom's school and got an A. My teacher would be very proud of me." We joke about it now, but it worked.
When you have a chance, google "sexual offender sites". You will find out how many in your area and just how close some of them are.
Hang in there mom, your doing the right thing.