updated 10/25/2010 AT 2:00 PM ET
•originally published 10/25/2010 AT 4:10 PM ET
Arquette, 36, took his little girl to Mr. Bones Pumpkin Patch in West Hollywood for a day of face-painting and fun on Sunday.
“David and Coco had a great time together at the pumpkin patch. Coco had her face painted like a cat and she looked adorable,” an observer tells PEOPLE. “She also seemed happy about spending time with her dad. David looked great and was in a wonderful mood as well.”
Coco, 6, participated in several activities, including a ride on the super slide and a stroll through the straw maze.
“David was very sweet and patient with Coco,” the observer says. Even when the valet mixed up several car keys and tried to give Arquette the wrong car, “he stayed calm and still gave a great tip,” the source adds.