This past year we went down to Utah for Christmas. While there, we took Zer0 up on his offer to go do the Kokopelli Series of geocaches. The series is made up of approximately 150 caches, placed in such a way as to resemble the Kokopelli. The link below offers a map view of the caches... zoom out to see the picture.
The caches were laid out in the desert and after much hiking, we found all of them. Though it wasn't about the numbers, we did hit the 1000 finds milestone. More important though was the adventure of wandering around the desert and completing this series.