This time it's the fabulous trip, not the destination. Emirates Airlines offers first class passengers on its A380s a "shower spa," reservable for thirty minutes per passenger, which includes five minutes of water for your shower while in flight. It comes complete with a gauge of how much water you have left.
A search for a round trip fare in a first class private suite on an Emirates A-380 with access to the shower spa on the Dubai to London Heathrow route next month turned up a modest fare of $8779 per person.
Photo is a screen grab from the Emirates web site. Watch two short videos featuring the shower spa on the Emirates site.