This review is just for the hot tubs as we didn't do anything else there.
My wife and I just moved to the area and visited the hot tubs last night. Very romantic and relaxed atmosphere. We had a great time--even at $13.50 per hour per person, we would do it again.
The hot tubs are private with a security gate and enclosure, so you can have a romantic time there without worrying about people suddenly joining you. The water seemed clean and at a nice temp, about 102 to 103, which made it easy to remain in the tub for the full hour (plus the 15 minute grace period the front desk gave us). Not sulfur smelling and not loaded with chlorine, our tub was really pleasant.
We climbed to the highest tub, and the walk is beautiful even at night with the overhanging trees (sycamore and oaks). We could also see plenty of stars clearly through the branches.
Bring your own towels to save the $2 rental. I believe you can also bring food and drink, but they probably have a no glass policy. We brought drinks in plastic bottles.
The stairs are a bit steep so people needing climbing assistance may want to stay on the lower levels. Reservations are recommended.