Sandy,
There are plenty of seats available for some of your older members. Also available for rental are wheelchairs or motorized carts. I think the info is on the website.
Parking is expensive, $13 per car and it is across the street from the site. It is a bg parking garage...not sure if they can handle large vehicles. There is a nice drop-off area at the site.
Food....VERY PRICEY....I usually bring a sandwich and a bottle of water. Bottle of water is $3.00, hot dog is $5. Best deal is the ice cream cone...$2.50(?). I would recommend going to the cafeteria if you don't bring food...still a bit pricey but better food.
The vendor area...WONDERFUL!!! I spend way toooooo much!