Hi Sarah!
Thanks so much for stopping by the Disney Parks Moms Panel! It sounds like your son and his girlfriend have some magical plans ahead of them as they prepare to visit Walt Disney World Resort's four amazing theme parks.
Walt Disney World Resort does a great job accommodating offsite guests that would like to be dropped off at any of the four theme parks:
Magic Kingdom Park,
Epcot ,
Disney's Hollywood Studios and
Disney's Animal Kingdom Theme Park. There are designated Drop Off and Pick Up areas at each park, and Cast Members at the park entrances can help direct you to these areas.
When you enter the Guest Parking area for each theme park, simply tell the Cast Member that you're dropping off guests. They'll direct you to the drop off location for that park. Epcot, Disney's Animal Kingdom Theme Park, and Disney's Hollywood Studios have drop off locations located a short walk from the entrance. When visiting Magic Kingdom Park, there is not a drop off area at the actual park entrance. Guests will need to be dropped off at the Ticket and Transportation Center, and then take the Monorail or ferry boat over to Magic Kingdom Park.
Once your son and his girlfriend are done with their day of fun at the theme park, simply return to the same area where you were dropped them off to pick them up. Easy peasy!
I hope this information is helpful, and that they enjoy their time visiting Walt Disney World Resort's theme parks. Have a magical day! - Diane W.