[watch a cartoon]
Let's watch a cartoon. / What about watching a cartoon?
[plant flowers]
Let's plant flowers. / What about planting flowers?
[play tennis]
Let's play tennis. / What about playing tennis?
[fly a kite]
Let's fly a kite. / What about flying a kite?
[go sailing]
Let's go sailing. / What about going sailing?
[play football]
Let's play football. / What about playing football?
[have a picnic]
Let's have a picnic. / What about having a picnic?
[make a snowman]
Let's make a snowman. / What about making a snowman?