Campingqueen the camp I was a director of had day and over night camps. It worked well and here is how we did it.

Over night kids got to pick their activities and go from activity to activity by themselves. Day camp was broken up into groups by grade and moved as a group. Each day camp group had 2 staff to guide them.

Over night staff ran the activities. So a few over night kids and a group of 4th graders could be at the lake together with the day camp staff helping. Over night staff running the event as life guards or sports staff ect.

Over night would eat lunch first as day camp had a snack to hold them over and group time. When over night when to bunk time day camp would eat lunch.

It worked very well and helped build our over night. Many kids start as day camp and would sign up again that same year as over night.

I was the Day Camp Director at the YMCA camp. If you have any questions please let me know.