They have these really neat old-fashioned, Free Red Trolley car service that stops all over the shopping center. Just look for the round signs or check out the maps that are located in all of the plaza's within the center.
Compared to Germany, the public transportation is almost non-existent. There are not that many bus stops throughout the city and they are far from each other.
You need a car, car, car! Did I mention car already?
However, the public transit agency serving the San Bernardino Valley and Rancho Cucamonga, is called Omnitrans.
To check the routes, schedule and prices go to the website below.