The travel idea
Let Registan be more than a photograph stop. Leave quiet time for architectural details and a separate part of the day for Shah-i-Zinda and markets.
What to consider
Bukhara and Tashkent are tempting additions, but each new city needs travel and check-in time. One city explored well can suit a short trip better.
Plan with more confidence
Ask about guide language, admission tickets and walking sections. Keep meals as part of the experience rather than squeezing them around a packed schedule.