With my boys, it really depends on what mode they're in, lol. I think Elvis' favorite thing to do is to make himself comfortable in a nice, warm lap. When they told me that he is a "lap cat", they sure weren't kidding! He also loves to run around and chase his brother when he gets his sudden bursts of energy.
Danny loves to play. He will attack anything and everything he can get his little paws on. When he sleeps, though, he sleeps hard.