With the hours you have available, if your ancestor owned property, the Register of Deeds office would be the place to start. The deed would give place of residence which hopefully would be where he came from.
The library there has a very good index file of newspapers. You may also want to just go through the newspapers covering the time period you are interested in.
The library may also have family files available. You may want to have a Family Group Sheet made out to leave there with your contact information.
There used to be a good restaurant on top of the bank building on the river. We haven't been in several years, but the food and the VIEW were wonderful.