I LOVED RIDING THE CABLE CARS!!! The staff were all so entertaining and friendly. I have never met such kind and warm people. They joke around with you as if they have been your friends for years. All the staff was as welcoming as the next. It was such a joy, from Mel to Carl. The ride does seem a bit like a roller coaster, but nothing nauseous. They usually point out sights, as the cable cars are filled with tourists.
All rides on the cable cars are a part of the transportation pass that you can buy at Powell Central Station at Union Square. If not, you can buy a one-way ride for $3 where the conductor has change on the cable car. The cars run constantly (practically every ten minutes), where there are only waits when the cars are filled.
http://www.sfcablecar.com/