If the view leads, MaHanakhon Sky Walk at King Power is the first candidate. A glass-floor deck atop one of Bangkok's tallest buildings, it reviews well on both volume and score, and going up around sunset gives you both daylight and the night view. It sits close to Chong Nonsi BTS station, which makes it easy to attach to an evening.
To prepare for a wet afternoon, secure one indoor attraction. SEA LIFE Bangkok & Madame Tussauds Bangkok connects to Siam Paragon and fills two or three hours with children, while Jurassic World The Experience Bangkok is a more recently opened indoor exhibition format. Both sit inside malls, so rain does not disturb the plan.
To give a whole day to children, Safari World Bangkok is the straightforward choice. It splits into a safari park and a marine park with fixed show times, so matching your arrival to the show schedule fills the day. Muang Boran (Ancient City) recreates architecture from across Thailand on an extensive outdoor site, toured by bicycle or cart.
The Erawan Museum takes you inside a vast three-headed elephant sculpture and sits in the same direction as Muang Boran, so the two combine into one day. Flow House Bangkok is a surf activity on an artificial wave, worth comparing when you want to add energy with children or teenagers.
To fill an evening, there is Calypso Cabaret Show, a cabaret near Asiatique with fixed performance times that make the evening easy to calculate and easy to place alongside riverside night market plans. Before booking, confirm entry times and seating tiers, how the voucher works, height and age rules, wet-weather operation and cancellation terms.