Hang Nga in Dalat is also called the crazy house. It's a large complex of buildings and connecting bridges, one lazily winding over the top roof, very narrow and without much in the way of handrails. The design lacks the angular simplicity of Gaudi's work in Barcelona, it's just... crazy. A large family of hobbits would love it, but all others need to watch their heads.
Dalat is otherwise unremarkable. It's a busy town around a lake with a few low hills, but nice enough to walk. At 1500m, it's cool and overcast, unlike hot Hoi An.