Most people think of tone paper as a vehicle for figure drawing with charcoal and white chalk. But it’s also a great base for landscape sketches in gouache. Here’s an example of a view of Prescott, Arizona, painted a while ago ago in opaque watercolors.
The trees in the lower right were scrubbed in with a big bristle brush, and the sky was painted thinly with white gouache. I laid down the semi-opaque ribbons of roadways with a white nylon flat, and came back with whiter touches for the cars and lines. At the end I placed just a couple of red accents in the central area.
The paper wasn’t a typical drawing paper, but rather a heavyweight stock that I got from a limited edition publisher. It’s thick enough that a sheet can stand up without buckling over. I had Kinko's bind up a sketchbook out of the stuff.
There must be commercial tone paper pads that have similar paper which can take a little water without buckling. Maybe someone can suggest sources in the comments.