Yes, you can generally ride most roller coasters with open-toed shoes, such as sandals or flip-flops, but there are significant safety and practical considerations. At most major theme parks like Disney, Universal, and Cedar Point, there is no universal ban on open-toed footwear; however, certain high-intensity or "floorless" coasters (where your feet dangle) may have specific rules. On these rides, you are often required to either remove loose-fitting sandals or secure them to avoid them falling off and becoming dangerous projectiles. Many parks provide "shoe bins" or nets on the loading platform for this purpose. From a practical standpoint, wearing flip-flops is often discouraged for a long day of walking, and they offer no protection if someone accidentally steps on your toes in a crowded queue. For the best experience, closed-toe athletic shoes with laces are the "gold standard" as they provide the support needed for miles of walking and remain securely on your feet during every loop, corkscrew, and high-speed drop.