Many visitors to San Francisco find that they don't need a car once they are downtown. Remember, Moscone Center is within walking distance of many San Francisco hotels. Schedules are convenient and prices are very affordable. This convenient and efficient rail service transports about 21,000 commuters daily between San Jose and San Francisco. Schedules are prominently posted at all stations.
Parking is at a premium at many stations.
There is also additional parking near the Sunnyvale CalTrain station. Parking is free at these lots. If possible, carpool to the station, or have someone drop you off. If parking, leave plenty of time to buy your ticket and get to the platform, as the trains do keep to a strict schedule. If you miss the shuttle take a cab to the station.