I haven't messed with it a lot yet but what I've seen of the app looks pretty cool. Easy access to park info, maps, phone numbers, etc.
Accessible through the link on the lower left of this page:
http://www.destateparks.com
or direct link here:
Apple:
http://itunes.apple.com/us/app…te-parks/id433959573?mt=8
Android:
https://market.android.com/det…are&feature=search_result