Great section of the San Pedro to visit. There is the marker for The Battle of the Bulls, but there are also other things to see. The old Townsite of Charleston, supposedly a town of "bad guys", is just a little north, and the Townsite of Millville is east from there, across the river.
There is the "old" Charleston bridge, only open to foot traffic now, that you can wander out on to have a look at the river from above. If you do venture out on the bridge, you will notice quite a few padlocks hanging on the side fences. I believe people (including myself) place them there as couples used to do at "The Pont de Arts" bridge in Paris, France.
Couples would cross the bridge and put a padlock on a section of the chainlink fence. The lock would represent their unbreakable love, which would stay there for all of eternity. They then would dramatically hurl the keys to the lock into the body of water under the bridge.
At this bridge, the locks are placed by couples, parents, children, or basically anyone wanting to perform a symbolic gesture of the love they share. I think it's a sweet thing to do :)
Besides that there is still the San Pedro, one of the few rivers in North America that flow to the North. Although it is not as big as it used to be, there is still water flowing. There are birds, minnows, crawfish, and you might even catch a glimpse of a turtle sunning on a rock. You can walk in the water or take a siesta on the banks in the shade of the tall Cottonwood trees.