I'm not so far from Chambersburg: I'm in Brunswick, MD, and work in Frederick MD. Basically, I'd say your best bet would be to look for where So Damn Thirsty plays, because it changes.
There really isn't a coherent "scene", as far as I can tell. You've got teenagers hanging out at the Hot topic, and surrounding mall, and older folks, like me are just kinda hanging out in the woodwork.
As for Tattoos- you should give Hub City Tattoos a shot. There's also Time Bomb and Mark of the Spark in Frederick.
However, I know you don't drive. That is a problem, I'll be honest. However, look at a map sometime, and you can see that I'm about 60 miles away. So, I do get around Chambersburg, every once in awhile- So PM me, we can exchange info, and I'll try to keep you informed of stuff, as best I can. Now, bear in mind, I'm pretty old, and I'm happily married, with a job, and a family, so, I'm not exactly mr excitement- but I still know a few things.
And so you gotta be strong You've got to just speak in tongues About how you belong
In popular culture - dEUS