Once back at the top, we took the shuttle bus back to the visitors center. We walked around the very informative visitors center while waiting for the bus to take us back to the Yavapai and became so engrossed that we almost missed the bus. We did notice it finally and made a mad dash for it. We barely made it and it was pretty full so we were sort of crammed in by the door. Ryan and Gina were discussing and pointing at a small grey object laying on the ground so I asked what was wrong. Seems Gina thought Ryan had kicked something while running to the bus and that the something might have fallen out of the camcorder bag. I looked at the object in the distance and thought, "hmmm, that is just about the size of the lens cap" so I said "quick, off the bus!" just as the doors were closing. We went back to the object and sure enough it was the lens cap! (and we just saved Ryan a week's worth of allowance to replace it).