Mrs. Puff will give you this quest near the beginning of Kelp Forest (only SpongeBob can start and finish this quest). Below is a guide from IGN on the locations of the 6 Campers, simply walk up to them and you should get an on-screen message saying "Camper Found":
https://www.ign.com/wikis/spongebob-squarepants-battle-for-b...Once you've found all 6, return to Mrs. Puff as SpongeBob to turn the quest in and get the Golden Spatula.