Krabi

Krabi is Thailand's southwest paradise — population 24,000 town + larger resort area, on the Andaman Sea coast with 200+ limestone karst islands rising from emerald waters. The town itself is small + functional; most travelers stay at Ao Nang Beach (15min from town, main resort strip with restaurants + bars + boats to islands) or Railay Beach (only accessible by longtail boat — peninsula cut off from mainland by limestone cliffs, 4 beaches: Railay West for sunset, Railay East for kayak/climb, Phra Nang Cave Beach for most beautiful, Tonsai for budget climbing).

The big draws: Phi Phi Islands day trip (most photographed Thailand spot — Maya Bay from 'The Beach' Leonardo DiCaprio 2000 film closed to swimming for ecosystem recovery, but viewable from boat; James Bond Island; Pileh Lagoon snorkeling), 4 Islands Tour (Chicken Island + Tup Island + Poda Island + Phra Nang — half-day longtail boat with 4 stops + lunch), and rock climbing at Railay (world-class limestone with 700+ routes for all levels).

Cheaper than Phuket by ~20%. 1.5h flight from Bangkok or 1h from Ko Samui (or 1.5h ferry). Cheaper alternatives nearby: Koh Lanta (1.5h south, quieter island), Koh Yao Noi (1.5h boat, hipster off-the-beaten-path).

Iconic southern Thai cuisine: Massaman curry (rich + creamy beef curry, $4-8 — invented Thailand south influence from Indian Muslim traders), Pad Thai (national dish, $2-5 — Ao Nang Night Market), Som Tam (papaya salad, $2-4), Tom Yum Goong (sour-spicy prawn soup, $4-8), Mango sticky rice (Thai dessert, $2-4), Singha + Chang beer ($2-4).

Bottom line: Krabi is canonical Thai islands + Phi Phi pilgrimage + cheaper Phuket alternative + climber paradise. 4-5 days hits Ao Nang + Railay + Phi Phi + 4 Islands + Tiger Cave Temple.