Watch this video of the Zapata Flyboard, and try to imagine if it's possible to have more fun on or above the water.
Those that are very cashed up can buy a Martin Jetpack, and have it to fly in one year. The quite well cashed up can test pilot the jetpack now. One day, or three days, hand over the money and you can be in the air.
The Martin Jetpack can have you in the air, flying 100 km per hour, and getting 50 km out of its 5 gallon tank.