U: Underwear. You've all seen someone without any, so you understand my answer.
V: Volcanos. Hawaii is made of volcanos.
W: Winter Wonderland. The one right outside my door is pretty wonderful.
X: Xanadu. In Xanadu did Kubla Khan a pleasure dome decree . . .
Y: Yams, candied, baked, etc. Also Yum-o! My kitchen will never be the same now that Rachael Ray and her Yum-o recipes are available.
Z: Zip-Lines. Sarah recommended this one.