September and October in Krabi can bring rain and changing sea conditions. This list includes shore-based activities and Hong Islands as a sea-day option.
Indoors there are Aonang Thai Cookery School and Siam Cuisine. Aonang runs at 09:00, 13:00 and 17:30 and takes one guest; Siam Cuisine makes six dishes, needs two guests and does not admit children aged eight or under.
Mangroves come two ways. The Tungyeepeng village half day covers a gondola and a coconut farm, leaving at 08:30 or 13:00; the mangrove kayak runs 08:00-16:00 with cafe lunch but can change with tide and weather.
If you stay on Lanta, the Lanta mangrove half day (pickup 07:50 or 11:50) and Lanta Elephant Sanctuary (pickup 07:30 or 13:00) are close by. The elephant program runs in light rain, but no-shows are not refunded.
Beach yoga is at 07:30-09:00 in the morning or 17:30-19:00 from January to October, a good fit for gaps between showers. The Hong half-day private tour needs four guests, excludes children under 11 and can have heavy speedboat bounce.
Before booking, confirm pickup area and surcharges, minimum numbers, age and health conditions, and the rules for running and refunds in rain.