(1)    Except as provided under sub. (1m), the commission shall make a thorough study of the county with reference to making reservations and acquisitions of lands therein for public uses, the improvement of such lands for parks, playgrounds, forest reservations, parkways and boulevards; make surveys, lay out maps, other plans and maps of a comprehensive county park system, and a county system of streets and parkways, including contiguous land of whatever shape or area designed to be ultimately used, in whole or in part, for highways, or, in whole or in part, for parkways; gather such further information in relation thereto as it deems useful and report the same to the county board. It shall make such other or further reports as may be requested by the county board. In making such studies, surveys and obtaining such information, and in making such reports, the commission shall give consideration, among other matters, to the health, comfort, enjoyment and general welfare of the people of the county, to the protection of streams, lakes and pools from pollution, to the use by the public of lakes, pools and the banks thereof, to the reforestation for public use and enjoyment of tracts of land, to the conservation of flooded areas, and to the preservation of places of natural beauty and of historic or scientific interest.

   (1m)   Any general manager appointed under s. 27.03 (2) shall have the administrative powers and duties prescribed for the commission under sub. (1).

   (2)   The county board thereafter may by ordinance adopt the plans proposed by the commission or general manager for such comprehensive county park system, or for such a county system of streets and parkways, in whole or in part, and with such changes or modifications as it deems necessary, and may subsequently alter, change, enlarge, extend or modify the same in any respect deemed necessary.