DS1 will be 2 years 4 months and DS2 will be 3 months when we go in Nov. We have a direct flight from KC to Orlando and then are staying in All Stars Sports for 5 days. We are not renting a car and will be using the Shuttle to the hotel and the buses to the parks. Should I bring the car seats? DS1 will have a seat on the plane and we can use his car seat then but DS2 will be on my lap/baby bjorn/sling. Are they required for the shuttle/buses, or can they even be used?