Those are some neat ideas. I prefer to play my own mode, which was just-now titled Conservationist.
Basically, you play a Navigator session, but you can't kill. Not animals (unless you breed them, but you have to leave some in the wild), not mobs, not nothing. Instead, you have to create wildlife preserves for the creatures to live in peace. It's a fun challenge to get a conga-line of Creepers chasing you, luring them into a habitat you've constructed and hoping you can seal the door and escape up a ladder before they blow it to pieces.
Eventually, once everything's mapped out, I take it upon myself to create full enclosures with toys, running water and viewing platforms for my imaginary guests.
Basically, you play a Navigator session, but you can't kill. Not animals (unless you breed them, but you have to leave some in the wild), not mobs, not nothing. Instead, you have to create wildlife preserves for the creatures to live in peace. It's a fun challenge to get a conga-line of Creepers chasing you, luring them into a habitat you've constructed and hoping you can seal the door and escape up a ladder before they blow it to pieces.
Eventually, once everything's mapped out, I take it upon myself to create full enclosures with toys, running water and viewing platforms for my imaginary guests.