We couldn't just tell them what we had planned, so we had Mark and Rebecca on Skype, wrapped several gifts as clues, then made them guess. The video at the end says it all! :-)
First, they opened a box of 4th of July crayons.
Then, Paul found a picture of their family's favorite road trip car.
"Yes, it's a block of wood, but what kind?" Answer: Cedar
Next, came the jig made by a man at the resort where they vacationed.
Finally, a gold bobber, which was part of a contest one year when the Cheney family was visiting the resort.
(I tried to embed the video here, but after several attempts I gave up and just made a new post. You'll have to watch the video there.)