Hi, Karla!
If you have a smart phone, there is a wonderful, free APP, My Disney Experience, which will let you know exactly which characters are appearing, where and at what times. You can also take a look at a Times Guide when you enter a park to see who is appearing that day.
Character Greetings change from time to time, but the best way to get an idea about where to find your favorites is by heading to Walt Disney World's website and entering "
Character Greetings" into the search bar. You'll find links to a helpful page for each of the theme parks and make your list accordingly.
In Magic Kingdom, head to
Ariel's Grotto to meet your favorite mermaid. Snow White is often found in Epcot's Germany Pavilion, and Aladdin can often be seen in Epcot's Morocco Pavilion. To see Jake and his friends, head over to Disney's Hollywood Studios, where they'll take the stage at
Disney Junior-Live on Stage! Jake also sometimes makes appearances at Disney's Hollywood Studios, too, so check that Times Guide for information about the days you'll be there.
Have a wonderfully magical visit to Walt Disney World! Send more questions as you think of them, Karla. We love to help!