So, I'm kind of a safety nut. My daughter will be 1.5 when we visit SSR in Nov. If we use Disney transportation, will she ride the buses without a carseat or do they have any built in? We're contemplating taking a car so that we can escape whenever we need to (plus she loves her nap time in the car) and then the carseat wouldn't be an issue. Of course that costs more money. Thoughts? Thanks.