we were thinking about a future visit to San Francisco looking at some options. Our grandson accidentally booked this tour at a rate of $260. When we found out within 15 minutes we tried to get a hold of Viator and asked for a refund. we tried to call their phone number. No one would answer and we only were able to leave a message. We also tried to reach them by email. hours later the only reply we got was a refusal to return our money. I highly recommend never using this company or the hop on hop off bus, since we were never in San Francisco or had intentions are using their bus, we thought it was only right that they give us our money back