Generally, you're allowed to keep the following items with you during your visit:
- ID/License
- Glasses
- Money for vending machine snacks
- Diaper and bottle if you bring a child
Most other objects, including your keys, must be stored in a locker that will be provided. There are, of course, objects you shouldn't bring, as well, such as:
- Medication of any sort
- Cigarettes or tobacco-related products
- Anything that can be considered or used as a weapon
- Illicit substances or materials