Thought I would pop back on here and give a review of the day I spent yesterday at Rock Haven Lodge in Murfreesboro, TN. I called a day ahead and spoke to a nice lady who was very informative about the resort. Better yet, I asked if they offered a youth or student discount and they do. For anyone under 35, its only $5 for a day pass. Cheaper than your local pool!
I drove the 45 minutes out there and pulled up to the gate. You are buzzed in and then meet Sue at the office. She is older (which may explain some of the weird email responses mentioned above) but overall really friendly. She gave me a map of the grounds and sent me on my way.
After parking my car, getting naked, and grabbing my things, I headed on my way to the pool. It was a sunny day and there were plenty of chairs by the pool to lounge in the sun as well as some chairs that were in shade by the trees. There weren't very many people there (primarily because it was Thursday at 10:00a) but I did end up meeting 6-7 people over the course of the 4 hours or so I was there. Everyone was very nice but the group tended to skew older (think 50+, probably again because it was a Thursday afternoon). Not once did it seem like I was odd man out due to being the youngest by about half.
As I was leaving, it seemed that a few more people were coming to the pool so I think that on a weekend it might get busier. One other thing I forgot to mention is they do have a walking trail, country store, and bathhouses. You can camp there if you want as well. Overall, it was a great day and I would recommend anyone in the nearby area to check it out.