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?

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