Need To Know
39, including 28 suites.
12pm, but flexible subject to availability. Check-in, 2pm.
Double rooms from $400.62 (THB12,950), excluding tax at 17.7 per cent.
Rates include breakfast in the restaurant, butler service and a speedboat shuttle between the hotel and Sathorn Central Pier (near Saphan Taksin BTS station).
Get active with a bout of muay Thai boxing, then chill out in the Opium Spa by Sodashi, which combines soothing treatments with a serene relaxation space. Come evening, the screening room beckons with its retro cinema seats.
At the hotel
Spa, library, screening room, cooking school, gym, yoga terrace, muay Thai boxing ring, boutique, meeting room, gardens, free WiFi throughout. In rooms: flatscreen IPTV, minibar, own-label toiletries. Pool Villas also star plunge pools and roof terraces.
Our favourite rooms
In the Main Residence, the light-drenched Riverview Suites offer dreamy Chao Phraya vistas and a stylish salon for lazy breakfasts. For your own plunge pool, retreat to the separate riverview Pool Villas, which boast lush courtyard gardens and an open-air roof terrace. Fancy extra space? Antique teak house Connie's Cottage has a bedroom upstairs and lavish living area below, and was shipped downriver from Ayutthaya by curio collector Connie Mangskau and silk merchant Jim Thompson.
Soak up prime river views from the generous outdoor infinity pool beside the Chao Phraya. Sleekly shaped, it's lined with stylish modern loungers and flanked by the handy Bathers Bar for refreshing sips.
Binoculars for scoping river boats; yoga gear for sun salutations on the terrace; a camera for snapping the exquisite antiques and art (we love the rare travel books and prints).
Smoking is allowed in outdoor public areas only. Pets are not permitted. A three-night minimum stay applies between 21 December 2014 and 3 January 2015.
The Siam is a sophisticated, antique-dotted abode best suited to grown-ups, but baby cots are free and extra beds for older kids cost THB4,470 a night. Babysitting is THB300 an hour, with 24 hours' notice, and kids are welcome in the restaurants.