GoCar's at San Diego Harbor

The geek-chic carts may be the first self-propelled example of a breed of smart devices that remove the guide from the tour, allowing visitors to explore and learn at their own speed.

The three-wheeled, two-seat GoCar, which is gasoline-powered, is made by Trigger Technics of the Netherlands. Customized with black racing stripes down its snub-nosed hood, the yellow vehicle sports the good looks of a Mini Cooper and weighs only 386 pounds.