Any resident citizen of the county, including county, city, and township officers, is eligible for appointment to the board of county park commissioners. Each appointed county park commissioner shall hold office for a term of three years, or until a successor is appointed and qualified. Any vacancy in the board must be filled for the unexpired term by appointment by the board of county commissioners as soon as practicable. The appointing authority shall establish the rate of compensation for park commissioners and actual expenses incurred by the commissioners may be reimbursed at the official reimbursement rates of the appointing authority. Unless otherwise agreed upon, the board of county park commissioners shall meet at the time of the regular meetings of the board of county commissioners upon the order of the chairman, and appointed members only are entitled to compensation for attendance at the concurrent meetings.