Nothing in this act limits in any way any liability which otherwise exists: (a) For willful or malicious failure to guard or warn against a dangerous condition, use, structure, or activity.
(b) For injury suffered in any case where the owner of nonagricultural land charges the person or persons who enter or go on the nonagricultural land for the recreational use thereof, except that in the case of nonagricultural land leased to the state or a subdivision thereof, any consideration received by the owner for such lease shall not be deemed a charge within the meaning of this section.