The board of county commissioners of such counties may dedicate land or buildings as provided in Section 2 herein¹ for a period of twenty-five (25) years, or for so long as the said lands and buildings shall be used or shall be convenient for use for said recreational purposes, or for a period of years not in excess of twenty-five (25) years, and for so long thereafter as the said lands and buildings may be used or may be convenient for use for said recreational purposes, provided that any dedication made pursuant to this section by the board of county commissioners shall be effective only after the said board of county commissioners shall have passed a resolution setting forth the terms of the dedication, and said resolution shall have been filed with the county clerk of said county; further provided that nothing in this section shall prevent such county from owning or operating recreational facilities without a formal dedication of such land or buildings as provided herein.