Walkthrough

1. How to Change the Time
2. Speak to Makuhita, and it will ask you to build an orange hut on one of the empty lots in the resort.
3. Purchase an Orange Hut kit from the PC and find a place to set up the construction site. Remember that you may need to raise your Environment Level for the kit to become purchasable.
4. Wait for the construction to be completed, or advance your system time one day ahead to instantly finish construction. Speak to Makuhita afterwards to finish the request!

Walkthrough source: Game8.