CoMaps is based off OsmAnd.

I tried it but it has a very steep learning curve

Hmm suspicous username. Are you a member of the Koga clan?

Not that quite detailed, just s basic OSM ones. I assume you could find a custom map and download that and run it off CoMaps.

It kind of depends on which park you are at. I was at a local zoo and it had every exhibit and animal marked.

May I recommens CoMaps. Offline pro privacy and has trails.