Great Lakes and Great Times: Michigan boasts four Great Lakes, 11,000 inland lakes, 36,000 miles of rivers and streams, 20 million acres of forests, 100 state and national parks and recreation areas, 1,300 miles of bike trails, 6,500 miles of snowmobile trails, the second-most ski areas in the nation, 650 public golf courses, 600 campgrounds, and an international dark-sky park-just for starters. Who We Are: The Department of Technology, Management and Budget (DTMB) supports the business operations of state agencies through a variety of services, including building management and maintenance, information technology, centralized contracting and procurement, budget and financial management, space planning and leasing, construction management, motor vehicle fleet operations, and oversight of the state retirement systems.