It could include sandy beaches, island groups, palm trees with coconuts, and dense coastal vegetation. Along the shore, there could be fishing huts, small harbors, and stranded boats to explore.
A new vehicle like a beach buggy would fit well. It would be a mix between a motorcycle and a car, offering fast and agile movement.
New wildlife like crabs or seagulls would improve the atmosphere. Fishing could also be expanded, for example by adding a fishing net that can be used from a boat.
As part of this biome, there could also be a huge ship out at sea that can only be reached by boat. It could contain valuable loot protected by a new boss or a special mission, creating a unique challenge and encouraging exploration and Teamwork. A complete costal & Tropical Biom😊!