This is simple. A painting canvas. It would help for a calm day on the beach at your condo with all the waves.
And yes, paint with it! You can even put the paintings on canvases that are not used for painting!
The painting canvas should have options for the canvas to help a bit with painting. Like, Sizes for the canvas to paint on, Background of White, Titanium White or Black or even custom!
People will probably use this to draw immature paintings however.