The Dead Fish Tower is a pretty unusual place - it seems to be mainly made of wood with metal roofing which doesn't join up. It mostly stays dry inside in the rain though and gives it a great look. Great atmosphere too. The food is Thai and there's a good selection of drinks including a few cocktails, and Angkor and Tiger beer on tap. Anyway it was my evening hangout for my stay there and I enjoyed it a lot - cheers!
More info and pics at their online ad (listed under website below); the website on their sign in the photo seems to be a joke (there's a website with that address, but it seems to have no connection).
Separated from Grand d'Angkor Hotel, you can find a performance house, which has special package: dinner featuring Cambodian traditional performances. The ticket is USD16** per person
Dress Code: Casual