Hanoi
Starts at Hoàn Kiếm Lake (7 Đinh Tiên Hoàng St) on weekdays; Hanoi Opera House on weekends.
Covers a loop through over 20 key attractions: Thăng Long Water Puppet Show, Ho Chi Minh Mausoleum, Flag Tower of Hanoi, Trấn Quốc Pagoda, One Pillar Pagoda, Temple of Literature, and more.
Alternative models (via other operators) offer:
4-hour unlimited pass with ~11 stops, ideal for quick daytime or evening explorations.
Longer-duration 24- or 48-hour passes, with 13-stop Red Route, free Wi-Fi, and audio guides in multiple languages/
Night Tour: Non-stop panoramic loop (approx. 50 minutes), great for viewing illuminated landmarks.