You will spawn on a small survival island (shown in the first & second image below). Then if you go straight ahead you will very soon come across this large mushroom island. So in this seed you will find several cool islands. If you are into that, then this is perfect for you. If you come across any cool things on the islands such as dungeons, strongholds or other things then let us know in the comments!
Credits goes to InfernoCrafter who found the seed.