Man, if you only were french canadian, that's all we have campfire songs.

It's a big part of our folklore

I usually don't play english songs around the fire but House of the rising sun is a must like Tele Master says.

Tears in heaven by clapton is pretty cool as Change the world.

You could always play South of heaven by slayer but I'm not sure about the reaction lol

I always to play Wherever you will go by The Calling, and I'm pretty sure you can pull it off nicely on the vocals too ;)

BTW, not that it has something to do with this post but check out the band Sinergy. Worth it if you don't know them.