I Love Bananas

 is an unmarked free quest in Fallout: New Vegas.

Quick walkthrough

 * Go to Vault 3
 * Reach the Living Quarters area
 * Speak to Rick Lancer in the holding cells in the Living Quarters
 * Find Daniel
 * Obtain the Fiend Prisoner Key by killing or pickpocketing Daniel
 * Unlock the holding cells

Detailed walkthrough
Three Caravaners are being held within Vault 3 by Fiends, within the holding cells in the Living Quarters. Speaking to Rick Lancer, he informs you that they were kidnapped and that there is no-one left alive who would be willing to pay a ransom for their release. Therefore it's just a matter of time before the Fiends realise this and kill them, so he asks for your help. He tells you that a Fiend named Daniel, who can be found in the sleeping area behind the holding cells, has the key.

Rick also mentions that Carter, a fourth member of the group who is now dead, knew the password to the Overseer's Computer. You can intimidate to get the password immediately, or agree to get the password if you help them all escape.

You can pick the lock of the cell door (hard difficulty), or find Daniel in a room towards the back of the sleeping area, and either kill or pickpocket him to get the key to the cell. He also has a key to the Vault 3 Maintenance area as well. You can then return to free the prisoners.

Journal entries
None