Birthday party

So we are doing a small party for my son who will be 4 in a few weeks. We are having it at a park and live in the south so it is gonna be HOT. We will be having it from 10am to 12 so no main meal will be served.

We are gonna have a cookie cake, cupcakes, savory snack mix and probably a veggie tray. Is that enough or do yall have any suggestions on more snacky stuff?

I'm trying to keep it simple but also offer enough variety.

I will also have a variety of drinks as well.