we did not pay to park them anywhere, they are small and fit into tight spaces....it works out to about $70 per person for a full day guided tour of the city....Value is relative but compare to renting a scooter for the day in rome or a waverunner in the bahamas and it is competitive....and try to pay for taxis to go to everywhere on the guided route (piers to golden gate to presidio to haight ashbury to seaside, etcs) and you will pay as well....anyway our girls and us all had a blast it was almost $300 for our family of four but there was nothing else we did that rivaled the experience....it is almost a year now and the girls are still talking about it