Check into hotel and relax by the pool after an early start — recommended hotels: Apricot Hotel Hanoi (rooftop pool, Old Quarter edge) or Pan Pacific Hanoi (large outdoor pool).
Most 1-night cruises (e.g., Paradise Elegance, Bhaya Classic, or Indochina Junk) check you in around 11:30–12:30; lunch served aboard as the boat sails past karst islands.
Most cruises include a stop for kayaking or a visit to Sung Sot (Surprise) Cave or similar; check your cruise itinerary for exact stops (activities usually run 14:00–17:00).
Arrive Da Nang and transfer (~20–30 min) to Furama Resort Danang (beachfront, big pools), or Fusion Maia (villa-style, pool), both ideal for beach stays and group celebrations.
Celebrate the bachelorette with a private lantern-placing boat on the Thu Bon River followed by a special dinner at a riverside restaurant or a private table at a beach club; book a private lantern boat and dinner in advance for a memorable night.
Join a cooking class (2.5–3.5h) that includes market visit, preparation, and lunch — Hoi An cooking classes are highly rated and show local techniques.
Check into a Hanoi hotel near the Old Quarter or West Lake; recommended: Apricot Hotel Hanoi or Pan Pacific Hanoi (both have pools). Dinner nearby and early night to recover.