A road trip
We took a trip yesterday to my brother-in-law's place. It's about 4 and a half hours' drive.
My in-laws' took our two older kids earlier, so we just had Mac. Which meant either we would have a really quiet trip with him sleeping or there might be a lot of crying. My wife kept him from taking a nap in the morning and so as soon as we took off he was out and he slept for 3 hours! So we just had about an hour where there was a chance of a crying baby... and he did awesomely.
The one thing we've learned with little kids is to get them to sleep as much as possible during the trip. This means a lot of times for a longer trip we'll take off in the middle of the night and hope they'll sleep all through the night. I'd highly recommend it.