No matter the temperature, I wear my running shoes. And I only ever wear running shoes when working out - they are not part of my regular wardrobe. But my feet would be miserable if I tried to wear sandals or anything else. I love flip flops, but would never wear the in a theme park - I'd be worried about my toes being stepped on, getting caught in and out of rides, etc. My typical theme park wardrobe are my runners, capri leggings if it is hot, long leggings if it is cool, a t-shirt and a cute sweatshirt. I've never been there when it's super cold. If it was going to be really hot, I'd wear a tank top instead of a t-shirt. But anyway, for feet, it's all about comfort and arch support in my world.