Yes, anyone can ride the Walt Disney World monorail system, as it is a complimentary transportation service provided for all guests, regardless of whether they are staying at a Disney resort or have a park ticket. There are three distinct lines: the Express line (connecting the Transportation and Ticket Center to Magic Kingdom), the Resort line (stopping at the Contemporary, Polynesian, and Grand Floridian resorts), and the Epcot line. While riding the monorail is free, you do not gain entry to the theme parks just by riding it; you will still need a valid ticket and reservation to pass through the park turnstiles at the monorail stations. The system is a popular "free activity" for visitors who want to "Resort Hop" or enjoy a scenic view of the property. Occasionally, during extremely high-capacity days (like New Year's Eve), Disney may limit monorail access to resort guests or those with dining reservations for crowd control, but for the vast majority of the year, it is an open and accessible "highway in the sky" for every visitor.