First, never steal backpacks. Second yes you cam leave it in the cubbies next to where you get on the coaster. You don't need to use the lockers. Third bring your own water, it is three dollars for a bottle here. Fourth don't buy food here ever! It is a rip off for any kind of food. Just go to a nearby restaurant then come back in.
No need to bring water; use the water fountains
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