By CARY ORDWAY CaliforniaWeekend.com If walking or driving the streets of San Francisco is not quite enough adventure for you, try joining the growing number of people who are seeing Bay area sights while balancing on board a Segway, that two-wheeled electric vehicle that was once hailed as the future of all personal travel. Not only will you see tourist landmarks, but you'll learn a new skill and face just enough of a challenge to keep you, well — on your toes. The Segway — formerly called the IT when it was first unveiled in 2001 by inventor Dean Kamen — was the object of considerable media speculation as people no less prescient than Apple's Steve Jobs suggested the new invention would be as fundamentally life-changing as the PC. When it was finally unveiled, the contraption actually seemed a bit odd looking — it resembles in some ways an old two-wheel push lawnmower, except this device allows you to step right onto it.