I agree for a family of 4 or 5 it would work out to far less money per person. For just the two of us though, it's comparable in price to an organized bus excursion where someone else does the driving for you, provides lunch, and narrates/"guides" the experience. I think we would probably get more out of it if someone is explaining stuff to us as we see it rather than one of us [likely me lol] driving for hours rather than relaxing and enjoying the scenery. As such, I think a car rental is out for us.