Krabi combines limestone coast, offshore islands and a forested interior. Ao Nang is the practical transport base, Railay is the dramatic beach-and-climbing stay, and Krabi Town suits travellers who value markets and local transport over a resort strip.
Ao Nang has the broadest choice of accommodation, restaurants and boat connections. Railay is reached by boat and rewards staying overnight if climbing, beaches and quieter mornings matter more than road access.
Phi Phi, Hong and other island trips depend on sea conditions. Keep the boat day movable, ask what the fare includes, and do not assume a tour will visit every named stop when weather changes.
Krabi Town offers a more local base for markets and the riverfront. The Emerald Pool, hot springs and inland nature areas lie in a different direction from the beaches, so they work better as a dedicated road day than an add-on after an island tour.
Rain can improve waterfalls while making trails, roads and boat departures less predictable. Check the Thai Meteorological Department forecast and current operator advice before committing to the exposed part of the plan.