A beautiful park in a beautiful area. I went to visit for the cherry blossoms this year and it was quite a hike but worth it. The vendors are quite expensive so I would bring food/drink with you. There are also public washrooms but I wouldn't count on them because they usually don't work. If you want to go for a quiet walk in the park I would recommend avoiding it for the month of May but any other time it is a wonderful place to take the dog for a walk or go on a walk with your loved one.
Parking tip: I always avoid the actual parking lot and park in the residential area across the street, its worth the walk if you enjoy large vintage looking houses.