If it wasn't for Pokémon GO, I never would have visited this place. For that, I thank Niantic for introducing such a great place to me! ;)
This place is beyond cool. There are trails, tons of vegetation, wildlife (i.e. cute little bunnies!), and bodies of water. They even have a modest sized observatory here that's opened for free on Fridays and Saturdays! You can even go fishing here provided you have a fishing license. Signs are littered across the many trails so be sure to take a look. You might learn something new. There is also a $1.50 beverage vending machine by the bathrooms for you to stay hydrated.
While it was only 100°F the day we visited, I recommend stopping by when the weather is cooler. It's probably even more enjoyable!