Make new terrain layout, Biomes and Mobs

My idea would be to create a new terrain layout to improve player mobility and make the world "flatter". In addition, create a Beach biome, with palm trees, coconut trees, shells, rocks, etc... Add coconut, crabs, seagulls, and mussels. To create a new structure, which would be an "abandoned cabin" that would have a new block, the "tropical roof," a roof that would look like straw. where there would be a chest and a straw bed, as well as a second structure, which would be called a "tropical kitchen" where there would be a grill with various tropical fish on it. And there would also be a hiding place beneath the cabin, where we would find a treasure map and various ores. And we would have the "sand path" that, when clicked with the shovel in hand, would create a path. In addition, we could create a straw hat, a flower necklace that would have a regeneration effect, and a coconut drink that would have both regeneration and saturation effects. And lastly, the mobs that would appear in that place are: Zombie mummies and all mobs with desert variations, crabs, turtles, and fish.