Summarize:

Especially if your camp is more than one day, not every camper may come each day. Make sure you keep a list of exactly who shows up for camp each day. This way the parent in charge knows how many kids to account for, feed, etc. In addition to knowing who will attend camp each day, the adult in charge should also keep a list of emergency contact numbers for each camper, as well as a list of any relevant allergies or dietary restrictions. Campers will work up big thirsts and appetites. Make sure to bring plenty of snacks and water, especially if any of the events are away from home, such as a nature walk. There is bound to be plenty of downtime between activities, while driving, while waiting for food, etc. Keep cards, boardgames, coloring books, and other toys on hand to keep the campers entertained while the adult host transitions between events. One of the great things about camp is also the spontaneity of some of the activities. Don't worry about adhering to the schedule at the possible cost of other fun. Let the campers get creative and even improvise some of their own fun in the moment. Camp traditions are what set many different summer camps apart. Over the day (or several days) of camp, have the campers come up with a camp name, a song, a mascot, and any traditions they want to uphold. It will make the experience that much more fun. One of your activities on the first day can even be to have campers make a sign for the camp on a poster or another creative surface. If your camp will last several days, then make sure each camper goes home at night with a reminder list for what they will need to bring the next day. You should also try to provide a general list reminding campers to bring sun screen, swimwear, towels, baseball gloves, or any other relevant necessities based on the theme of your camp. Most of all, pay attention to the campers. Try to keep everyone at camp involved, engaged, and having fun. If this means changing plans at the last minute in the name of fun, go for it. Ultimately the summer camp is for the campers, so get their feedback and don't be afraid to try new things!
Keep an attendance sheet. Have contact information available. Provide plenty of snacks and water. Keep games on hand. Forget the schedule when the occasion calls for it. Establish traditions. Remind campers what they'll need. Have fun!