I'm opting for a park stroller for my daughter. I've got her tag designed and we will bring a balloon from off the resort to make it identifiable from a distance, and I will put her Disney beach towel down in the seat. I'll use light up stuff I'm also bringing from elsewhere to light it up at night. I'll attach one glowie to the base of the balloon for the distance locating. I've been looking at all sorts of light up favors all over the internet trying to find cheap and unique items for our trip.
Edited to add that I would probably make a seat cover and matching canopy cover in either a princess or character theme if I was bringing my own.