Saginaw Bay is fairly shallow and therefore can get very rough in the wind. Don't get caught out too far when bad weather rolls in. As far as fishing goes Mike-s is correct, yellow perch and walleye are it. Lake trout have been scarce for a few years. You might check out the thumb area above Port Huron all the way over to Sebewaing for campgrounds and marinas.
We used to live in the Harrisville area and the Huron shore above Bay City has some very nice marinas, AuGres, Tawas, Harrisville, Alpena, that should be able to fix you up with a rental.