This page will link to the various clubs as well as the many activities that are going on around Brunei at any time.
A couple of links to get you started!
The Royal Brunei Yacht Club is a great meeting point for expatriates in Brunei.Weekend sailing is very popular as is a lot of power boating around the area. http://www.royalbruneiyachtclub.com/
Brunei Music Society holds a number of concerts each year featuring artistes from all over the world. www.bruneimusicsociety.org