There is a jiffy john (or johns) near the main parking lot, but there is a nice bathroom over by the playground area. There are lots of trails to walk, which go by the river (Blue trail and River trail for sure). You can even access a beachy area. To get to the playground area, when you turn in the driveway, take the first left. This takes you over to the kayak dock and horse trails too. That is where the playground equipment and bathrooms are. There's also a covered pavillion with picnic tables.
We take the grandpup there quite frequently! Of course, she doesn't need to use restroom facilities!

Here's a map...
