Hongya Cave
Cliffside stilt-house complex and night-time city scene; very busy in the evening, with many stairs.
A dramatic mountain-and-river metropolis with layered transit, historic streets and night views. Expect steep slopes, stairs and winter chill. Four nights from 25 Dec, arriving at Chongqing North at 08:28 on the K507 sleeper from Xi'an.

Cliffside stilt-house complex and night-time city scene; very busy in the evening, with many stairs.
Central pedestrian district and nearby riverfront; keep the route compact and use a taxi or metro if steep streets tire the family.
See the metro pass through a residential building; short visit, best outside commuter peaks.
Distinctive cross-river ride with views; queues and weather can affect operation.
Indoor cultural option and useful cold-weather respite; confirm weekly closure and entry rules.
Major Buddhist stone-carving heritage outside the urban core; requires a separate full-day transport plan.
Chongqing Rail Transit Local bus routes/timetables China Railway tickets
Build slack into journeys: stations can be deep underground and pedestrian routes change elevation quickly. Use a taxi for the last leg where steep walks would tire the grandparents.