Are there regulations for water skiing in a ASEL aircraft?
(bush-air.com)

I couldn't find any regulations for it. But the closest thing to an official mention of it I found was in a 2009 piece on Anchorage Daily News, where an unlicensed pilot water skied, hit a sandbar, and it didn't end nicely for his Super Cub.

The FAA regional counsel said:


  The practice is called water-skiing, and it is not encouraged. It was developed for landing in tight quarters, like sand bars where space is short, but doing it wrong can be disastrous.