Fun is a word that people use when something random occurs that they enjoyed. Keep it random, keep it fun! 

There's no need to plan everything, sometimes the best plan to is the let yourself do what someone else wants to do. 

Routines come very naturally. When you get to a new place, often you wake up at the same time, find a good restaurant nearby and keep on repeating the same activities every day. Whether that's going back to the same restaurant, hanging out with the same people, drinking the same kind of beer, or indulging in the same habits. 

If you're making your income in a "rich" country and living in a middle-class or poor country it's easy to order food from Rappi or Uber Eats. To stay healthy while working abroad, leave the hostel/hotel at least once per day even if that means just going for a walk. 

To keep traveling while working fun, you should constantly try something new and if you find yourself in a a rut, always going to the same places and doing the same activities. Change locations!