Excalibur Electronics Motorized Pool Lounger
Rule your pool from a suitable throne--the inflatable [[xref:http://www.excaliburelectronics.com/featr-outdoor3.html|Excalibur Motorized Pool Lounger|Excalibur Motorized Pool Lounger]] (US$150), which Time Magazine named one of the [[xref:http://www.time.com/time/specials/packages/article/0,28804,1939342_1939395_1939673,00.html|Best Inventions of 2006|Best Inventions of 2006]]. The joysticks on each armrest control independent propellers to transport your monarchical self in any desired direction.
For more-competitive water fun, check out the same company's [[xref:http://www.amazon.com/Excalibur-Motorized-Bumper-Boat/dp/B000PSU12O/ref=pd_sbs_t_4|Motorized Bumper Boat|Motorized Bumper Boat]] (US$60). Buy two and encourage your paladins to engage in noodle jousts for your royal favor.