The county planning and recreation commission shall have power: To prepare and recommend to the county commission plans relating to the location, extension, construction and improvement of highways, bridges, viaducts, subways, construction and maintenance of sewers and canals, within or without the property so acquired for such purposes; to design, construct and maintain any and all improvement work, buildings or other structures pertaining to the development of such recreational projects as is now herein specifically delegated only to the county commission, and adopt rules and regulations for and control all institutions, businesses, recreations, or other affairs or property within the area acquired without limit, any agreement or contract to the contrary notwithstanding; to contract and be contracted with as authorized agent of the county in connection with the purposes herein authorized; to lease, let, license or grant concessions to such properties or structures under its control on such terms and conditions as will conserve and promote the public interest; to expend money received for all such purposes; provided, that the commission shall on or before the first day of March of each year file a complete report with the county commission showing all moneys received and from what source and expenditures made, which shall be a public record; to make and enforce within its limits any local, police, health, sanitary, public convenience or other regulation as is desirable for the public welfare; to employ suitable persons, labor and expert assistance to acquire such property, design and construct improvements thereon and maintain and control the same.