Same two countries everyone books, the quiet half of each. Longtails instead of speedboats, east Bali instead of the south, and enough days in each place that you stop checking the time. Tell me the shape and I'll fill in the rest.

The two countries don't share a monsoon, which is the whole planning problem - and the reason a May-to-October trip should be weighted east. Send me your month and I'll tell you which coast behaves before anything is booked.
Rains have just stopped. Everything is green, prices haven't climbed and the islands are half full.
Perfect weather, highest prices. Book villas and boats three months out, or take the shoulder.
Warmest water of the year, crowds thinning. Songkran in mid-April is worth planning around, either way.
Thailand's west coast gets rough seas and boats cancel. Bali stays fine, and cheap, right through it.
Two countries, two applications, one handler. Indonesia's e-Visa is quick and comes through in a day; Thailand's tourist e-Visa is applied for before you fly. We prep both files, check every document, and submit for you.