Our kids will be 3 1/2 years old, and 7 months old when we go in January for 12 days. We're staying at the Poly, can you keep the stoller open when you ride the monorail and boat? So we would only have to worry about carrying it on the bus when we went to AK and Hollywood Studios. It's a new Graco, so it folds pretty well and is about 30 pounds. Would a 7 mo old be OK in one of the rented ones? Does anyone have problems with them being stolen? TIA, Stephanie