Welcome to the Disney Parks Moms Panel! Thank you so much for visiting us with this excellent question! Choosing which three FastPass+ selections to make each day during our Walt Disney World Resort vacation is one of my favorite steps in the planning process! I get even more excited for our trip once our FastPass+ reservations are made.
I'm happy to share that since you have the Park Hopper option, after your initial three FastPass+ selections have been used for the day at Disney's Hollywood Studios, or the last arrival window has passed, you may book a fourth FastPass+ at a different theme park! You can make additional FastPass+ selections (one at a time), once your initial three have been used for the day, by visiting a FastPass+ kiosk in the park or with the My Disney Experience Mobile App.
Angel, I hope this information helps you with your exciting plans for your upcoming Disney vacation. I highly recommend trying to get FastPass+ for Toy Story Mania! at Disney's Hollywood Studios! You will have a rootin', tootin' good time!
On 9/14/2017 Melissa from PA Asked: What is the tier system for fast passes? I'm confused I can't pick any 3 per day?