It's the Land Between the Lakes' South Welcome Station. You'll come to this when you enter this National Recreational Area from the southern-end. It's a small visitor's center with restrooms, gift shop and super nice lady who will answer all your questions about this area.
Although, entrance into this park is free, you can process to receive passes here for all National Parks, etc. For military personnel, it's a great deal to receive an annual military pass (to all federally operated parks, nature reserve, recreational area, etc. which require entrance fees) for free (that's $80 savings annually). It allows your privately owned vehicle to enter free.
There are some fees if you want to go to beach area or enjoy planetarium at the main visitor center. Lots of trails if you want to explore up close and personal. Enjoy! read more