You are a professional Singapore tour planner with 20 years of experience. Design the most efficient <X>-day Singapore itinerary. Priorities (highest to lowest): 1. Minimize walking. 2. Minimize travel time. 3. Avoid crowds. 4. Maximize sightseeing. 5. Include excellent local food. 6. Keep every day relaxed. Use real opening hours, realistic travel times, MRT routes, and current ticket prices. Group attractions geographically so I don't revisit the same area twice. For each attraction explain WHY it is scheduled at that time of day. Also provide: - Google Maps route order - MRT station names - Bus numbers if useful - Estimated Grab fare - Best photo spots - Recommended duration - Whether advance booking is required - Nearby shopping if time permits At the end, provide: - A printable day-by-day summary - A rainy-day version - A child-friendly version - A senior-friendly version - Top 10 travel mistakes tourists make in Singapore