Any apps that have MAPS of actual national/state/county parks?

I downloaded “all trails” on my iphone, and am quite disappointed. I find the name misleading. It just give you driving directions, a google map, and brief discription of each park.

I’m looking for a app that has MAPS of each park SHOWING TRAILS and have detailed written descriptions of them.

Any such thing?

Either of these fit the bill?

http://www.cartosoft.com/national-park-maps-iphone

Depending on where you live, many (most) hiking trails are going to be in National Forest or BLM land.