I'm not at home to have access to my pictures, but I do know this was taken with a 10-22mm lens, my favorite.
Based on the percentage of distortion, I'd guess I was most likely right near the 10-11mm mark.
I remember being a bit disappointed I couldn't fit the entire palm into the frame, but I certainly won't complain about the result...no way would I have been able to take this shot without a wide angle anyway.
Glad you enjoyed it, I had a fun time working the angles and was lucky enough to even catch one of those tiny, toy looking cars.
Take it easy,