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Cheap little plastic animals individually wrapped in paper that s/he can unwrap. Those drawing things with the bar that erases the picture, the name of which I have forgotten. Leave just before nap so DC sleeps a couple of hours.
Our portable DVD player has been a godsend. DC's were 3y6m & 1y10m when we got it. ( DS is now 4y8m and DD is 3) It has a remote so I can control it even when driving. Leaving around nap time is also good. Make sure they can get to snacks & drinks if you are on your own. We tend to put Thomas the tank engine feature lengths or disney DVDs on, as they are between 60 & 90 minutes long, then once it finishes we find somewhere to stop and give the DC's 20/30 mins to run around, unless they are asleep. We haven't had any travel sickness with them, ironically both of them were more sick when they were RF.