There are a lot of ideas. Some questions to help.
Why are you planning a trip? Is it for just research, or to see highlights of the city?
If for research, is there a specific name or family?
Have you done any background work on them?
Do you want to go to the courthouse? Library? Cemeteries?
Are you going to be there for more than one day so that you need to know where restaurants and motels are?
Are you on a time limit?
When do you expect to go? If it will include cemeteries, you may want to wait until close to Memorial Day because most cemeteries are muddy and the Sexton's have them cleaned up by the holiday.
The court house and library have set hours, but if you need to contact someone about locating burials, you may have to contact the townships prior to your trip.
I have done this frequently, especially when I will be some distance from home. It helps to make every precious minute count and makes for a more productive trip.