Can we bring our own tubes if we are just going tubing down the river? If so how much does it cost?

You can bring your own tubes. We always use their's so we don't ruin ours, and it's $15 per person to tube. Not sure if it's less of you bring your own but I would imagine you still have to pay for transportation to the starting point.

I recommend tubing from the state park

I believe they no longer take you if you are not buying from them or camping there