Naps

I am fighting naps in my house. In my rational mind, I know that my babies are 4 and really don't have to take a nap anymore, but I am just having a really hard time figuring out how I am going to fill those 2-3 hours every afternnon in some quiet fashion while Zachary, who is only 2, takes his nap. I know that I am far from the first mom to ever encounter this, but still, I am baffled. Also, there are some days that my four year olds really need a nap and I want to make sure that it's not a big deal if I want them to lay down. I definitely plan on having some quiet time for them in the afternoon, but I can't make them stay in their rooms for two hours, so I continue to think....and think....