It's easy to make your way around Tokyo on the subways, buses and trains that cover the capital like a spider web.

But not many people know about another way to get around — water buses. Also known as water taxis, their popularity has grown thanks to the opening of Tokyo Skytree along the Sumida River.

While operators say they saw an increase in passengers last business year when the world's tallest tower opened, they believe water buses have great potential to attract even more tourists in coming years.