Hi Lisa,
Welcome to the Disney Parks Moms Panel! I'm so excited to hEAR you're planning to visit "The Most Magical Place on Earth" with your little one!
As a mom of four Mouseketeers, I'm happy to assist you with this question. If you only have one day to spend in the parks, I recommend
Magic Kingdom Park based on the age of your little one. I have always found the iconic park to have the most attractions geared for younger Guests. Your 18-month-old will be able to experience any attraction that is categorized for Guests of
"Any Age" or "Any Height." Your little one will love
Disney Festival of Fantasy Parade which features beautiful costuming, an amazing score and vibrant floats featuring Disney Princesses and favorite Disney Characters. I also highly recommend watching
Happily Ever After, an amazing nighttime spectacular and a "must do" for my family when visiting Walt Disney World Resort.
If you decide to visit a second park, I would suggest
Disney's Animal Kingdom Theme Park in order to experience
Kilimanjaro Safaris, Festival of the Lion King and Pandora - The World of Avatar.
I hope this information is helpful to you, Lisa. Let us know if you have any additional questions. We would love to assist you further in planning a magical trip!
Jodie