Thailand.

The first Bangkok decision is river versus Sukhumvit, and it is a dining-and-pace decision more than a hotel-ranking one. River hotels (Mandarin Oriental, Capella Bangkok) give a calmer, more visually distinct base with direct boat access to riverside dining, at the cost of a longer car ride to the Sukhumvit restaurant and nightlife corridor. Sukhumvit and Ploenchit hotels put the traveler inside Bangkok's densest Michelin and cocktail-bar cluster, trading the river view for a shorter reservation commute. Choose river for a calmer, culture-and-dining Bangkok stay; choose Sukhumvit for a dining-led, high-frequency-reservation stay.

Transfer planning is the actual failure point in most Thailand itineraries, not hotel selection. Andaman island transfers by speedboat are weather-dependent and can be delayed or rerouted with little notice during shoulder-season swells; helicopter transfer removes the weather risk but needs to be booked well ahead and confirmed against the receiving property's landing capability. Bangkok-to-island domestic flights compress at peak season and should be booked with a buffer connection, not a same-day arrival transfer to a boat. The itineraries that go wrong are the ones that treat the transfer as a formality booked last, not a planning input booked first.