We spend many an hour doing physical activity in the mornings to tucker them out for the afternoon.
Since the boys have transitioning away from naps, we have had "quiet time" instead. Tanner and Noel usually crash, but Hayden usually doesn't sleep (though he does like to tuck his stuffed zebra in for a nap).
On a side note, Hayden has been doing an excellent job of using the potty while we are out and about. :-)