You pay by the day. They have small and large lockers.We have always gotten a small one for our family of four, and was able to fit everything in the small one. Usually a bag with shoes, towels ,clothes sunscreen. You can open it as many times as you want. It was snug, but it fit. When you return your key you have the option of getting $2 back or usually a cup like the resort cups. We always opt for the cup if the design is different than theones we already have. Last year we got nemo cups from blizzard beach.