The county commissions of all counties of class one may in their discretion appoint a board of at least five but not more than seven resident citizens of the county, one of whom may be an engineer or landscape gardener, to be known and designated as “The Board of Park Commissioners”, the members of said board to act without compensation. The board shall have the power to make suggestions and plans for the use, development and maintenance of any lots, tracts, parcels of ground acquired and used for the purposes aforesaid, but said board shall have no authority to make any contracts or bind the county in any manner whatsoever.