Hello, Kyle! Thanks for hopping over to visit us at the Disney Parks Moms Panel.
The Florida Resident 3-Day or 4-Day Ticket is one of the best Walt Disney World Resort deals out there. We used them to get in a few trips to my favorite place when my son was a baby and we knew we wouldn't get there enough to justify renewing our Florida Resident Seasonal Passes. It's also a great option for visiting the parks for a long weekend, or to try them out before upgrading to an Annual or Seasonal Pass.
The three (or four) days on your ticket are only valid at any one of the four Walt Disney World Resort theme parks per day, so you'd need to add the Park Hopper option if you wanted to split your time between the parks on any of those days.
If you're picking up the Discover Disney Ticket, keep in mind that it will expire on June 5, 2015. You'll also have blockout dates during the Easter holiday, March 30 - April 9 at Magic Kingdom Park only. For the regular Florida Resident 3-Day and 4-Day Ticket, blockout dates for the rest of 2015 are March 28 - April 10; June 6 - August 13; and December 17 - January 3, 2016, and they expire six months after you first use them.
Hope this helps you plan your fun-filled Florida days at Walt Disney World, Kyle. Come see us again if we can offer any more assistance.
Have a magical day!
Kathy K.