Once you’ve been bitten by the travel bug, it’s difficult to keep yourself plodding away in the daily grind. But for many people, their job is the primary way that they finance their adventures. Striking a balance between hours worked and hours spent on life-changing trips is usually dependent on how much money you earn. But what if there was a way to boost the income that you already have, so that it keeps working for you even when you’re away from the office? Here are 5 ways to do just that.