What would there be for a group of teenagers? Is there enough for them to spend a whole day?

Water craft rental, child play area, walking trails. That would depend on the teens.

I think is enough for them to enjoy a whole day. They can do a lot of activities. I didn't see camping area, teenager playing sports and swimming in the lake, they put a restricted area to the swimmers. It's a beatiful park.

At melton hill damn park thye have places to rent for camping or rv camping the areavis huge there is a sandy beach and roped off area for swimming but no boat or any craft rentals they sell floats

Have no idea, I've been to Knoxville but not to any parks, so I have no idea. Sorry