An Act amending the act of February 2, 1966 (1965 P. L. 1860, No. 586), entitled "An act encouraging landowners to make land and water areas available to the public for recreational purposes by limiting liability in connection therewith, and repealing certain acts," further defining the lands to which the act is applicable; and further providing for immunity relating to sports, playground and certain pleasure-driving use of property, and for the immunity of the Commonwealth and its political subdivisions.