What do you do after you got the UFO parts on animal crossing wild world ds?

After collecting all the UFO parts in Animal Crossing: Wild World for the DS, you need to return them to the character named Celeste, who is usually found in the museum. Once you give her all the parts, she will reward you with the special item, the "UFO," which you can then display in your home or outside in your town. Additionally, you can continue to interact with the game's various features and events, as there's always something new to explore.