C.O.
BD:
I can understand your son's excitement!!
I understand you have a small town - but you can start with the community center - http://augustaga.gov/index.aspx?NID=616
then contact your local mayor and other state officials - especially programs that are encouraging kids to get off the streets and into programs.
Contact Tony Hawk - http://tonyhawk.com/ - he is a professional skater and from what I understand helps get things like this started.
Have your son state the purpose of the park.
Where he believes would be the best place to put the park
How it will benefit the community (jobs, income, etc.)
Also contact the YMCA - http://www.ymca.net/contact-us/
get them involved.
Then call radio stations and news stations. Get publicity.
It won't happen overnight and it will take time - but the first I think of is Tony Hawk and the YMCA.
GOOD LUCK!!