Nothing in this Act limits in any way any liability which otherwise exists:
         (a) For willful and wanton failure by an owner-lessor
    
to guard or warn against a dangerous condition, use, structure, or activity on leased land.
        (b) For injury suffered by a person in any case where
    
the owner-lessor of leased land assesses a charge against that person who enters or goes on the leased land for recreational use.