Dennison to Houchins is your best bet. Be mindful that the river gets a lot of action in the summer and especially weekends. If oyu tent camp it can be hard to find a spot that isn't already occupied.

If you hammock camp you have much more options obviously but the farther you go downriver the banks are more steep mud banks and it is harder to get out on the bank.

Also you are not supposed to camp within a certain distance (maybe 1/2 mile?) of the ferry crossings (now just the one unfortunately).

Plenty of fish in the river to be caught. Be mindful of the flow. Too high and it is dangerous and there are no gravel bars to tent camp on. Too low and you are dragging through riffles on the front end of your trip.

Smallmouth up near dennisons, largmenouth and crappie the closer you get to Houchins. It makes a dramatic change in character going through the park. The L&D at Brownsville impacts the river about 3 miles above Houchins. After that it is mostly all slackwater.

Another good trip is to park at Nolin Dam and go to Houchins. You can camp at Second Creek lower campsite.

Make sure you get your permit form the visitor center. And tell them to open back up ferry operations at Houchins.