This might be a bit cliched. Sorry if it seems that way to you, but it's a bit different from the other ones. There's only one layer of grass above bedrock, and there are actually 25 different biomes, so there are different mob spawns in different places. There's also tall grass everywhere, so you can start a wheat farm.

Goals:
Make a wheat farm
Kill one of every mob
Go one night without killing any mobs
Make a full set of armor
Make a house, must be at least 5 by 5 by 4
Make a stone slab
Make a tree farm

Comment saying how many goals you completed.

Additional Notes

It's amazing what WorldPainter can do...