Looking for a challenge? Try this seed called "survival seed"
-Most of the map is ocean and with only a few islands. .
-You spawn on a small island with only one tree in the middle of the map.
-There's a few mushroom islands and islands with one tree and are distant from each other.
Even more challenging is "worst seed ever"
-The map is mostly ocean again.
-You spawn underwater far North of the map.
-There are many tiny islands scattered across the map.
-Only one island has a tree on the entire map and it's near the middle of the map.