I've just got a good idea for survival.

The map:A only desert map.

From start:

1.Cheat and get a sapling and 5 grass blocks(If you don't,you will never get saplings or grass)

2.Better idea is to use too many items.

How to survival tips:

1.Make a cactus farm.

2.Get bones to grow grass.

Rules:

1.Don't use grass from the rivers until day 20(in game).

2.Only a desert map.

3.Don't cheat after you get the sapling and the 5 grass blocks.

Quests:

1.Make a cactus farm(20x20)

2.Make a fortress(at least 30x30)

3.Grow a forest(biome must be 40x40,at least)

4.Make a strange town(like huts of wool and down roads)

5.Make a cactus wall(very good idea!)

Recomended mod:

myBiome