Tam Tam Bar is a very good place to spend your nights in Hoi An. Start there with a wonderful dinner - the food is delicious, probably the best Western food available in Central Vietnam.
Try to get a table on the balcony or in front of the building and you can watch the passers-by from up there. After that have a refreshing cocktail, a tasty fruit shake or a cool beer and move to the bar area. You'll easily get into contact with the people there - mainly Australians, as it seems. As far as I know, the owner is from down under, too. Tam Tam offers a wide selection of drinks and food and, although the prices are above average, should not be missed.