During the US. Civil War, this land was used as a supply storage area and several wine cellars were dug into the hills. A few of them are still intact (others are permanently closed due to cave-in dangers) and you can view them.
The park itself has some great open spaces and nice scenery. A perfect place to throw out a blanket and catch some rays on a summer day. There are picnic tables and grill stands for cooking (bring your own fire materials). They have playgrounds and a ball field and public restrooms in pretty good condition.
Admission is free.
There is a shelter that can also be rented for $75 per day and it has its own fireplace and tables and is suitable for a group of 40 or so people.