Some games to play around the campfire include "Name That Tune" and "Hot Seat." Any spoken game works well, too, such as "Telephone" and "Famous First Names."
To play Name That Tune, someone hums a tune while everyone else tries to guess what it is. For Hot Seat, one person is chosen to be in the hot seat. Everyone else is shown a word or phrase, and they have to try to get the person to guess it. For Telephone, someone thinks of a phrase and whispers it in the ear of the person next to him. The phrase continues down the line until the last person says the phrase out loud, which will inevitably have changed. In Famous First Names, someone thinks of a first name. Each other person tries to think of a famous person with that name in turn, and if someone fails to come up with a name, he is out.