RPR is closest to IOA. You could either walk to City Walk or take the boat to City Walk which takes you closer towards USF in front of Nascar Cafe. Since you're staying on site, I wouldn't recommend you walking out towards the parking garages for a stroller and then walking back. Once you get to the garages, you would then have to walk through 2 of the long moving walkways to head to the central hub where it'll split off to the two garages. On the other side of this hub is stoller/wheelchair rental across from the bathrooms. If City Walk has them, then that might work out best for you. If not, then go for one of the parks.