You just wanna shower?

注意 zhu4yi4 pay attention to, be aware of
防 fang2 prevent, protect, take measures
滑 hua2 slide, slip

I suggest "Mind the slippery floor". Native speakers, anyone?

One anonymous blogger suggested:

"Slippery when wet" or "Caution: wet floor"

Taken in the Popoko Hotel in Zhuhai 珠海, Guangdong 广东 Province. Thanks, David!

P.S. By the way, the "Deluxe Suite" is 50 Dollars...