Blocks are scheduled length, not opening hours. The two red-edged blocks are the only immovable ones — everything else can slide when it rains.
Flights and the Airbnb are excluded — already paid. Dollars converted at an assumed ฿34 = $1; check the real rate. Carry ฿6,000–8,000 cash and card the rest — malls, Grab and 7-Eleven take card; temples, stalls, ferries and tuk-tuks do not.
BTS and MRT are separate systems on separate fares — a change between them costs a second fare, which is what the route cards mean by "+฿". Grab's in-app price excludes the expressway toll, which you hand the driver in cash. Off-peak, the metered taxi wins; in rain or at 18:00, Grab surges 30–50% and the meter wins by more.
Your flat sits at the eastern end of the BTS Sukhumvit line, one interchange from the MRT Blue line at Asok — and the Blue line now runs all the way to Sanam Chai, three minutes' walk from Wat Pho. That's why this plan almost never books a taxi: the old city is a single train ride, not a ฿250 crawl through Rama IV traffic. Between 16:00 and 20:00 the trains beat Grab by a wide margin; after 21:00 Grab beats everything.
760/7 SO NYX
Khlong Tan, Khlong Toei, Bangkok
Confirm the exact station in the listing when you arrive — it decides whether Thong Lo is a walk or a stop.
Swap the outdoor half for the Siam skywalk malls, ICONSIAM across the river, or a long massage. The Bangkok Art & Culture Centre at National Stadium and Museum Siam are both closed Mondays, so they only substitute on days 1 and 2. The one thing that can't slip is the Grand Palace morning: its ticket office shuts at 15:30 and there is no second morning left.