How do pilots travel from remote private airports after landing? What if you fly your own personal plane to a small private airport in the countryside that has no public transportation? I imagine that most pilots don't have a car parked at each private airport they intend on flying to. That is, of course, unless your car is small enough to fit inside your plane. If you want to go somewhere twenty miles from the airport, for example, do you just call a taxi or ask a friend in that town to pick you up in their car?
You do whatever you can.

Sometimes you call a taxi/Uber, sometimes you walk, sometimes you pack a small folding bicycle into your plane, and sometimes you borrow the airport car.

Many small airports in the US have a car (often a retired police car) available for itinerant pilots to borrow.  It's usually a scary rusted out pile of junk, but it works.  If you borrow it you're expected to return it promptly &amp; with a full tank of gas. 

It's wise to make arrangements for ground transportation before you arrive - there's no guarantee that any particular option (except walking) is going to be convenient and available.