Camping trip this summer - what am I forgetting?

Planning our first real camping trip with the kids (5, 8, and 10). We have a tent, sleeping bags, and some basic gear. Going to be at a KOA campground in Colorado for like 4 days.

I've been making lists but I feel like I'm still forgetting something obvious. Do you guys have any camping essentials that aren't on the typical 'what to bring' list? Like, the things you didn't think about until you actually needed them?

Also any tips for keeping kids entertained in the evenings that don't involve screens? We want to do s'mores and card games but looking for other ideas too.