Camp Hours: 9 a.m. to 4 p.m. Extended hours available from 7 a.m. to 9 a.m. and 4 p.m. to 6 p.m. for an additional fee. There is no better place to spend the day doing lots of fun science activities than MOSI. Bring two snacks and wear clothing that can get messy. Bring lunch or buy your own from the MOSI Cafe. Preregistration is required. Attention: Please note that any promotional or multiple week discounts will not be indicated on the order submitted from this website. If your order qualifies for any of these discounts, they will be applied when your order is processed in-house by a MOSI Reservationist. A $2.50 processing fee will be applied to the final order. Please submit one order per child.