Gilbert enjoys watching me play Wii Fit. We created a Mii for him and he enjoys standing on the Wii board. Little Man does enjoy some of the games, but prefers to watch daddy instructing me along the way as to which games I should play.
However, what Gilbert enjoys the most is to hold the Wii controller. I've taught him the value of the 'A' button. As you can imagine, that is all he pushes. I've had a few games altered as he pushes the button mid-game!