So, there's not really such a place as Hidden Lake State Park. But Harpeth River State Park is essentially three small parks that you have to drive between to access. Hidden Lake is one of those three small parks within Harpeth River State Park, and it's easily my favorite of the three park areas. We did the Hidden Lake Trail and the Ridge Loop Trail. The hidden lake at the heart of the Hidden Lake area is really pretty and well worth checking out. The Hidden Lake area also has the remains of a 1940s resort that you can see along your hike. We turned the Hidden Lake Trail into a loop that met up with the Ridge Loop Trail, so we got a bit confused about where we were in the park. Still, being able to hike all along the hidden lake was very cool! Even if you add up all the trails in this area of the park, it doesn't add up to much hiking. But if you're looking for a short trail or two with a view or two, this area of the park might be a good place to check out! read more