Voyage is a fantastic world generation mod that uses all vanilla blocks and blends new biomes seamlessly adding new depths to discover. You’ll notice the terrain has gotten much more hilly with expansive desert mountains and mixed desert hills. Now you’ll have a mix of desert biomes blended together.
There’s even a biome called mount that adds peaks so high they pass the clouds.
And for more tropical locales, this mod brings lukewarm and warm lagoons and changes the water to a more teal hue.