Suggestions???

In my heart of hearts I know I'm just stuck for a while, but I thought I'd ask anyways on the off chance someone can help me out. So here it goes...

Em is at that age where she's wanting to skip her naps (and occasionally does if there's too much going on) but still needs to take them. Cooper is just starting to have a predictable pattern for his naps. Now that the reflux and everything else has cleared up, it seems like in the last two months or so he takes a good morning nap and another good afternoon nap. Here's the problem. Cooper generally sleeps from 9-10:30 or 11. By the time he gets changed, and fed, it's lunch time for Em (who doesn't like food not being on time and gets rather cranky if she's not fed), and she sleeps from just after her lunch around 12 until about 2. That's right around the time when Cooper is getting sleepy again, and he goes down for his second nap at 2.

For the last few months, I've just packed them both in the car when stores open at 9 and have just done my thing grocery shopping and such. However, the trend is that on days where there's no crib/bed napping and we're making stops at various places, neither kid sleeps well and I get a massive headache by bedtime from them whining (the whining is MY fault, not theirs, but it still grinds the nerves a bit).

So my question is this: I know others have been where I'm at. How do you get things done (emails, grocery shopping, laundry, etc) when there is ZERO DOWNTIME? Todd and I are talking about starting Em at a school, but with the school holidays because of the World Cup and my parents coming, that won't be until the end of August at the earliest. Soooooo, any ideas (or commiseration, because we all know frustrated moms feel better knowing they're not the ONLY ones in the universe with that particular problem!)???

Any suggestions are greatly appreciated!