Depends on where you live. There are huge swaths of public land in the US where anyone is allowed to hike, explore, camp, hunt, or just shoot guns into the dirt

Depends on where you live. There are huge swaths of public land in the US where anyone is allowed to hike, explore, camp, hunt, or just shoot guns into the dirt. There are also many State and National parks which are cheap or free to visit. But yes, once a private entity owns the land in the US you'll need permission to do anything.