National Museum of Scotland
National Museum of Scotland is the strongest free indoor option in this shortlist, with enough variety to work for mixed ages and changing energy levels.
Free museum entry
Best for: Mixed ages, rainy weather, free city days, and parents who want one low-risk answer that can still fill hours.
Rainy-day fit: Excellent because the core visit is indoors, central, and broad enough to work even if energy levels change halfway through.
Worth knowing: Packed lunches are allowed in the Lunch Space, and the calmer Tower Entrance is useful if you want a step-free arrival.