What songs can you play on acoustic guitar?

I used to play pretty much only acoustic guitar but the past few months I haven't really played it at all and have just been playing electric. Last week I was at a party and there was a guitar at this dude's house and my friends know I play a little and they hand me a guitar and I realized I completely forgot most of the songs I used to play. I played a couple Alkaline Trio songs for them and a couple Blink songs and Outside by Staind and time of your life by green day but that was all I could remember. I can improv alright but people seem to enjoy songs they know. My question is what songs do you think sound really good acoustic because I am going to start playing my acoustic again but I dont know what to learn.