Best match
Burgess Falls State Park
It is the strongest first-visit default: a memorable payoff, a clear destination, and an outing that can fit without consuming the entire day.
Meaningful alternative
A calm morning paddle from an appropriate access point. Quieter and closer to the water, but requires equipment, PFDs, and good wind and wake judgment.
Afternoon
Lunch followed by real downtime; add a short lake access stop only if the group still wants it.
Meal or evening
Choose a restaurant along the route rather than creating a second long drive.
Time reality
Allow 6–8 hours with lunch and recovery time.
Access or reservation warning
Verify park hours, trail conditions, weather, and any reservation requirement on official sites before leaving.
Rain or closure fallback: Move to a Cookeville indoor stop or Tony’s Rainy-Day Rescue plan.