Hi Tara,
Welcome to the Disney Parks Moms Panel and thank you for sending us your question. Because you only have a one day Theme Park Ticket with the Park Hopper Option, it will be important to make sure you are using the proper tickets on each day as not to "waste" the Park Hopper Option.
When I have had different types of
Theme Park Tickets in my My Disney Experience Account, I have been able to "prioritize" my Theme Park Tickets according to which Theme Park Tickets I wanted to use first. All you will need to do is visit
Guest Relations prior to entering the Theme Park on your first day and ask to make sure the ticket you would like to use appears first. From there when you get to the touch point at the front of the Theme Park, I like to double check with the Cast Member that the correct ticket was in fact used (I am a worrier). When you would like to choose to use your One Day Theme Park Ticket with the Park Hopper Option, head back to Guest Relations prior to entering the Theme Park and ask the Cast Member to re-prioritize your tickets so that the Theme Park Ticket with the Park Hopper Option is first on the tickets. Again, when I get to the touch point and use my Ticket, I double check with the Cast Member to avoid issues later on. The following day, you won't need to go back to Guest Relations since your One Day Ticket has been used, it will automatically select your 3 day base ticket.
I hope you have a magical time at Walt Disney World Resort, Tara. Please let us know if you have any other questions, we are always happy to help.
Stephanie