Fallout Walkthrough: Hubtown

The largest city in the wasteland

List
Missing Caravans
Caravan Escort Quests (repeatable)
Water for the Vault
Decker's Assassination Missions (two total, Merchant and Jain)
Help the Sheriff defeat Decker and his gang
Bob the Iguana Stick Salesman (Blackmail or Turn in)
Loan Shark
Hit the various shops and buy what you want