It is no surprise that a majority of the Asian countries have to build up rather than across, and it also makes sense to build on top of existing building rather than build another tall structure. This is what the Sky Park, found on top of the Marina Bay Sands is; an entirely different world on top of existing structures.
Yes, it may serve a purpose alongside the hotel but it offers a whole range of entertainment including casinos, bars, restaurants and the world’s largest outdoor swimming pool (a 150 meter long pool that has an invisible wall that goes over the edge of the hotel).
The ship-looking structure is 200 meters above the ground and overlooks an entire bay with the entire bay looking at it, and maybe you. Actually, they will definitely be looking at you and wishing that they could experience one of the most expensive hotels in the world.