luggage storage near europa-park?

hi everyone! i'm paying a visit to europa-park; we are arriving in rust on a saturday (staying at an apartment hotel) then checking out the next day before going to europa-park. any advice on where we can leave our large suitcases while we're at the park?

we cannot leave it with the apartment hotel, and the lockers at europa-park are too small to fit our suitcases. any idea? would really appreciate any advice; thank you!🙏🏻