Ok, that's really not my style of music but if I recall, Greenday did a great accoustic piece with only guitar and vocals.
Time of your life
Here's the link.
http://www.greenday.net/tabs/tabs_timeofyourlife.txt
If you don't feel ready to pick the notes just strum them it's going to as good anyway.
I really don't know a lot of punk so I may not be able to help you much more than that sorry.
This the link to almost all greenday songs.
http://www.greenday.net/tabs.html