Visiting the Castle ruins is beautiful! (And it's free!)
There are very nice facilities (restrooms) and parking areas close to all the trails.
It's a short level walk (paved to accommodate strollers and wheelchairs) to the Castle ruins with a water fountain, kiosk historical boards and many benches along the way, all over looking the natural beauty of the Ozarks and the Spring below.
But our favorite thing to do is cove up near the Spring (beneath the Castle ruins) and shoot the shoot.
What you do is load your boat with a delicious picnic, noodle floats etc. and head by water to the cove where the lake meets the spring.
For the somewhat adventurous (heck, I'm a fat old lady and I still do it) you swim to the footpath, climb up the muddy, slippery bank (don't worry, there's always someone there to give you a hand) walk to the top of the narrow, swift shoot and lay back to enjoy the brief refreshing, ice cold ride!
The little rapids shoot you straight into the warm lake.
You'll discover you can stand with one foot in the chilly spring water and the other in the warm water of the lake.
It's very safe with just enough scary to give ya' a little thrill.
Even supervised, vested little kids love it as long as Mom or Dad are there to help and encourage!
It's a very popular, local family outing, especially when it's really hot.
After lunch, you can walk the beautiful trail to the cave and view the Spring close up, then spend the rest of the day relaxing on your float between more laugh filled shoots to cool off.