Wearing slip on Vans to Six Flags?

If you must wear those shoes, then just take them off before you go on any coasters without a floor (i.e. Medusa) since there is a possibility of them falling off. They will not fall off on standard sit-down coasters that have a floor (like Boomerang) - so just take them off on rides where your feet are dangling...they allow you to leave your shoes near the railings close to the exit (the opposite side to where you load onto the train - you will see other shoes there).