First time junior camp counselor: any advice?

When I first started my internship search 6 months ago, I didn't expect myself to be a camp counselor at a park/observatory. It's a day camp, and it's mainly focused on teaching kids about native ecosystems.

I'm a wildlife and fisheries undergraduate. During my volunteer work for nonprofits, I'm used to talking to families about nature. I'm pretty extroverted and feel comfortable being around people all day, but this is my first time working with kids as a job. The age range is 1st,2nd and 3rd graders for 5 weeks than 4th, 5th and 6th graders for 4 weeks. Any advice on what to expect on being in charge of kids? a little nervous because every kid is someone's baby I'm responsible for, I want to do my best