Thanks for reaching out! The short answer would be to fly, arriving at the Charlottetown Airport. A lot of people do drive to PEI from other parts of Canada and from the US and make the travel a part of their trip, but depending on where you are coming from, that could be a long drive.
Flying is the probably the fastest and easiest way to come to Prince Edward Island and then you could rent a car when you get here. Even though we are a small island, only 280 kilometers long (174 miles) you would need a car to enjoy all we have to offer.
As you are probably aware, PEI currently has travel restrictions in place due to Covid-19. You can keep up to date on the restrictions by clicking here.
I hope this helps!