A Park Hopper Ticket allows Guests to visit more than one park per day. Guests must make a theme park reservation for the first park they plan to visit. After entering that first park, Guests will be able to visit the next park starting at 11:00 AM and go between the parks until each park's regularly scheduled closure.
You now can only park hop AFTER 2PM.So you'll have to wait until well after lunchtime if you're planning on visiting another park. However, this rule is different for Annual Passholders.
Yes, the convenient and complimentary Walt Disney World Bus Service and other Disney transportation run between theme parks. You will head to the bus stop outside each theme park where a sign will direct you to the appropriate pick-up corral.
If you only have one day to do it all, Park Hopper is critical. Maybe you have three days to spend at Walt Disney World, but you want to see four parks. In order to see multiple parks worth of stuff in one day, you'll need that Park Hopper.
Complimentary Resort transportation begins 45 minutes prior to Disney theme park opening time and up to 1 hour after Disney theme park closing time. Additionally, buses operate until 11:00 PM from the Disney Springs area.
The short answer is: As long as you have a valid theme park ticket with a Park Hopper option or an annual pass, you can park hop as many times as you'd like! Of course, you must also have a theme park reservation for the first park you visit.
It's easiest to Park Hop between EPCOT and Disney's Hollywood Studios due to the Skyliner, boat service, and walkway between the two parks. Intuitively, this makes these two parks the perfect pair. While we love World Showcase at night, you aren't missing much if you skip the EPCOT Forever fireworks.
As a general matter, Animal Kingdom is the park that requires the least strategy and is the easiest place to beat the crowds in all of Walt Disney World. It doesn't require Genie+ or Individual Lightning Lanes, and is pretty easy to knock out everything–and then some–if you stay for a full day.
I would say Hollywood studios and animal kingdom, but as others have said doing Epcot and Hollywood studios on the same day make sense because they are so close together. The only problem with starting at Hollywood and ending at Epcot is it would preclude you from attempting to ride Guardians of the Galaxy.
How often do the buses run? The standard line is that Disney buses run about every 20 minutes. In practice, this could be as often as every five minutes or as infrequently as every 30 minutes, depending on the time of day and crowd levels at Walt Disney World.