The second is in Mad Mulligan's Mine, on the wall of a little shack beside the waterfall. The first is located on the back of a gravestone in the cemetery west of the Giddyup Kid Protectron. Look for the gorilla statue to the right of the door and pass through a patch in the hedge to get to the statue's back. The second is just outside the primate house. From the entrance, the order of turns is: right, right, left, left and right. The first Cappy is through the hedge maze beneath the treehouse, against a wall on the eastern edge. There is one located southwest of the Fizztop Grille, on the large wall just left of the restrooms building. To see the code, either simply take off the helmet (one might have to re-equip the Cappy glasses even though the box in front of them is ticked off as if they are already equipped), or exit the power armor, click on the hidden Cappy, then re-enter the power armor. Note that the Cappy glasses do not work when worn under power armor.
#Happy summer walkthrough 3.7 update
Click on the revealed figure to register the code and update the quest. Without the Cappy glasses equipped, the player sees only a fuzzy Cappy figure with a blurred speech bubble with the glasses equipped the code is revealed. The "hidden Cappy" figures are paintings on concrete surfaces in public areas of the park, and there are ten to be found.
Once close to a quest marker, it disappears, encouraging a thorough search of the area. She gives her sunglasses and a holotape to the Sole Survivor to allow them to help her search for the hidden Cappys. Given that the reward was meeting John-Caleb Bradberton, the creator of Nuka-Cola, she figures that his office might contain the original recipe of the drink. Intercepting the conversation reveals that she has come to find the reward for finding hidden Cappys throughout the park. Between the Parlor and the Fizztop Grille, Sierra Petrovita is encountered talking to a raider.