So I’m going to a splash pad tomorrow with a friend and it’s about a 30-45 minute drive away from my…

So I’m going to a splash pad tomorrow with a friend and it’s about a 30-45 minute drive away from my house... I don’t want to forget anything and I need a couple of tips. Here’s the things I have packed: sunscreen, swim diapers, towels, hat, swim suit, snacks, sandals, and I’m going to put some Gatorade in her bag. Should I wear a swim suit too since I’ll be in the water with her or just wear shorts and t-shirt and bring extra clothes? How much Gatorade should I pack? Am I forgetting anything?