Minecraft wiki entry for Best_biomes_for_homes, associated text: Like the desert, come back here after venturing to the mainland so you can have wood to start your gameplay with.
You can get dirt blocks to build a bridge to the mainland.
If you find one of these biomes when in a boat, use the extra space to take a mooshroom with you back to your base. It is also a good idea to note down its coordinates.
Make sure to sleep regularly in this biome, because if you forget to sleep for 3 days you will be attacked by a group of phantoms when leaving this biome (even if you just leave for one block).