The first three days cover the core — Chaweng, the north-coast temples, Ang Thong Marine Park and Lamai. Then a ferry day to a neighbouring island, and a final morning that's nothing but a beach, a viewpoint and a spa. This plan is built to slow you down.
Koh Samui isn't a checklist island. It's a coconut island in the Gulf of Thailand whose natural rhythm goes: swim while the sea is still calm, eat lunch under the palms, nap through the hottest hour, then wander out for the sunset. A 3-day trip covers the highlights; five days is the length that lets the island be itself.
This 5-day plan builds on the 3-day plan by adding an island-hopping day and downtime — not more sights. The first three days keep the core shape (Chaweng + the temples · Ang Thong · Lamai + the south), then Day 4 crosses by ferry to Koh Tao or Koh Phangan, and Day 5 has no schedule beyond a beach, a viewpoint and a spa. With less time, the 3-day itinerary is the better fit.
The one thing to get right before booking is the season — Samui sits on the Gulf coast, so its weather is the reverse of Phuket and Krabi: the best window is January–April, with a second drier spell around June–August, while October–December is the real rainy season (peaking around November), when seas get rough enough that Ang Thong tours cancel often. Check month by month in our best time to visit guide, compare the two coasts in Phuket vs Samui, and choose your base beach carefully — it shapes every day of this plan (where to stay guide).
Figures below are per person per day, assuming two people sharing a 3–4★ resort room (about ฿1,200–2,800/night/room), excluding flights or travel to the island. Island prices run a notch above the mainland, room rates climb noticeably over Christmas–New Year and July–August, and everything moves with the season and how early you book.
| Item | Day 1 (Chaweng + Temples) |
Day 2 (Ang Thong) |
Day 3 (Lamai + South) |
Day 4 (Island Hop) |
Day 5 (Spa + Departure) |
|---|---|---|---|---|---|
| Accommodation (per person) | ฿600–1,400 (3–4★, two sharing) |
฿600–1,400 | ฿600–1,400 | ฿600–1,400 | ฿600–1,400 |
| Tours / tickets / activities | ฿0–100 (temples free + donation) |
฿1,500–2,800 (Ang Thong tour) |
฿0–200 (most sights free) |
฿400–2,500 (Phangan ferry – Tao tour) |
฿300–1,500 (spa) |
| On-island transport | ฿300–700 (incl. airport transfer) |
฿0–300 (tour picks you up) |
฿150–600 (scooter / charter) |
฿100–400 (pier transfers) |
฿300–700 (incl. airport run) |
| Food | ฿300–800 | ฿300–800 | ฿300–800 | ฿300–800 | ฿300–800 |
| Total / person / day | ~฿1,200–3,000 | ~฿2,400–5,300 | ~฿1,050–3,000 | ~฿1,400–5,100 | ~฿1,500–4,400 |
For the full category-by-category breakdown, see our Koh Samui trip budget guide, or compare stays at every price point in the Top 10 Koh Samui Hotels.