Probably sound bias but I think you'll get to see lots of "unexpected treasures" in Brunei. Several mosques, the Sultan Omar Ali Saifuddien and the Jame' Asr to name two of the bigger mosque. Kg Ayer (Water village) has several places, locations of interest, you can take a boat taxi to make a round around the village.
Flickr is a good site to look for sample photos of Brunei.
Thanks for all the inputs... heading back sg tml... did went temburong but did not have time to really visit the forest trail and trek. Went back bandar and gadong and juz spent 1 or 2 days walking around and took some pics of the mosques etc.