Hello Synthia!
I'm so glad you're here with your question! Our family loves having the privilege of using the Armed Forces Salute tickets.
Your
Armed Forces Salute Park Hopper Plus Water Parks, Fun & More tickets will grant you
four days of access to the four major theme parks (Magic Kingdom Park, Disney's Hollywood Studios, Disney's Animal Kingdom, and Epcot Park). You'll be able to hop between these parks on those four days.
Your ticket will also grant you
four entries into the "Water Parks, Fun and More" (WPF&M) options (Disney's Blizzard Beach, Disney's Typhoon Lagoon, Oak Trail Golf Course, and DisneyQuest Interactive Theme Park, and ESPN Wide World of Sports). You can come and go between the same location as many times as you wish, but if you "hop" to another location, you will use up another entry. For example, if you went to DisneyQuest in the morning and Typhoon Lagoon in the afternoon, you will have used two of your WPF&M entries.
You can also use one of your major theme park days and one of your WPF&M in the same day, say to visit Epcot in the morning and DisneyQuest that night. This would use up an entitlement from both parts of the ticket.
As far as activating your tickets, yes they can be activated (or purchased ) at Guest Relations in Downtown Disney.
I hope this helps you plan your magical vacation. Please come back and see me if you have any other questions!
Magical Wishes,
Ashley