You may reserve a stopover with a 1-way award ticket booked with Mileage Strategy miles. Also, you will not pay for any gas surcharges when traveling Qantas. I always enjoy flying with Air Tahiti Nui: the flower if you board, the colors from the pillows/blankets, the entertaining protection video, etcetera. https://businessflightshop.co.uk/blog/what-are-the-benefits-of-volunteering-while-you-travel/