Welcome BACK, Ashley!
A lot of guests will say that their secret to a successful Disney Day is good pair of walking shoes or dry socks, but my biggest parenting tip is to bring or rent a stroller if you're traveling with a
Mouseketeer.
Yes! UPPAbaby strollers are more than welcome at Disney's Theme Parks in all of their various configurations. (Even with a PiggyBack board!) I actually have a Vista, and it gets more use at both Walt Disney World Resort and Disneyland Resort than it does anywhere else. Let me know if you have any stroller questions specific to this brand or in general.
Do note that your stroller will spend a lot of time in Stroller Parking Lots, as they are not allowed to wait with you in an attraction queue nor are they able to be accommodated at a Table-Service Dining Location. There's usually a Cast Member in these lots who constantly moves the strollers closer together to fill in the holes as others are picked up, so you may find it a row or two over from where you left it. (Which has definitely given me a momentary heart attack a time or two.) So bring or buy something that will help you find your stroller, especially at night, like a classic Mickey balloon or battery operated lights.
Pro Tips: Don't forget the stroller accessories! If you're visiting in the winter, get the footmuff! (It zips like a sleeping bag so you don't have to worry about the top layer falling off like a loose blanket would.) During the summer, bring the rain cover. Get some kind of parent caddy or cup holder for yourself. And get the snack tray; sometimes it's the only way I can get my guy to eat as he gets too excited to eat at character meals.
We'll See You Real Soon, Ashley!
~Kristen
PS - Check out these over a dozen
Moms Panel Planning Videos specifically for littles ones!