Natureconfirmed
Mount Kalaga National Park
A rugged wilderness area along Leonida's northern edge, offering hunting, fishing, kayaking, and off-road trails. Coverage suggests the surrounding backwoods are home to eccentric, isolated communities rather than tourists.
Source
Trailer 1 @ 0s
Confirmed park name and activities from Rockstar's official GTA VI trailer and site descriptions; details compiled from GamesRadar and PCGamer's location rundowns.