Civilization. While it CAN be a stressful game if you crank up the difficulty to Deity, at prince or king, it’s just so much fun.
With the advanced setup options, you can set up a game for however you are feeling at the time, explore a large world (however full or empty you want it), expand and watch your empire cover the map, learn and find all the new stuff in the world, conquer everybody, be a neutral power broker, launch into space.