Seeking hardwood floor advice

As I've mentioned on previous posts we were told that the house was originally built in 1750, we decided to  on Sunday  to peal back the carpet and see what the hearth and wood around it looked like in the parlor. To our pleasant discovery it appears to be original hardwoods. We were literally jumping up and down with this discovery. Now the question is what to do with them? From first glance it doesn't look like they need to be refinished, so how do we keep them clean and prevent dirt and gunk from filling the wear in the planks? Are there any hardwood experts out there that can help us?

Unfortunately, I didn't have my good camera out there this weekend. Here are some pictures of what the floor looks like:

 The hearth, this might need some work :)

 As you can see there is wear and tear, but we would like to keep this as close to original as possible