Decide what the day must accomplish
A buffer day does not need a full sightseeing schedule. List the tasks your group actually needs: sleep, laundry, packing, supplies or margin before the next transport leg. The purpose determines the best position.
If an immediate early departure would strain the group, a day after arrival may help. If the group expects to need time after the long route, reserve it near the departure city. Choose the purpose before choosing the city.
Keep the stop on the route
Mark the arrival point, main destination area and exit point on one map. A useful buffer lies on a city you already pass through. The answer changes with a northern, southern or combined itinerary and with your actual flight plan.
Include hotel changes, vehicle transfers and luggage handling when comparing placements. A supposed rest day that forces an extra transfer or removes the next day's breathing room may not provide much rest.
Leave the day's activities adjustable
Keep a nearby, manageable activity as an option, while making meals, rest and free time the base plan. Add one visit if everyone feels ready. Otherwise use the day for preparation and recovery.
Transport schedules, venue access and hotel rules can change. Confirm specific plans with the operators before booking and departure. This method does not claim that either city has easier conditions on a particular day.
Scope
This article offers general family travel planning and communication guidance. Confirm current access, bookings, transport, weather and prices with relevant official channels or providers before travel.