Mark and Allan rode a couple of Harley Softtails up to the top of Haleakalā on the Island of Maui. This is definetly one of the coolest rides out there. I haven't been riding for very long but I don't imagine that I'll be able to top this one any time soon.
Haleakalā (Hawaiian for "House of the Sun") is a massive shield volcano that forms more than 75% of the Hawaiian island of Maui. The summit is at 10,023 ft (we started at sea level).
Here is a picture of Mark and Allan.
For more pictures see the photo gallery.