Fourteen days for a deep, unhurried exploration of Bangkok and nearby escapes.
Days 1–7 follow the one-week itinerary above; add an evening Muay Thai match, a proper spa day, and a second day-trip to Kanchanaburi.
Days 8–10: deep neighbourhood exploration (Thonburi canals, Dusit, Lat Phrao local life); Day 11–12: overnight to Hua Hin or Koh Chang for a beach break.
Return refreshed; revisit favourite food spots; a sunset river cruise; extra time at Bangkok National Museum; shopping for gifts.
Two weeks is long enough to feel like you live here — build in one completely free day per week with no plan; the city reveals itself when you're not trying.
A two-week trip benefits from mixing splurge nights (a riverside hotel, a tasting menu) with genuinely cheap days (street food, local transit) — pacing spend the same way you pace activity keeps the trip sustainable.
Resist the urge to repeat every major sight from a shorter visit; use the extra time for depth in fewer neighbourhoods rather than a longer checklist of one-time attractions.