The second set of haks you need are the new Bioware Tropical Island and Underwater Caves tilesets.
DO NOT download the whole 1.67 update.
Only download the tilesets from Bioware's web site here:
(If you use Windows, you will get an exe file that will put the haks in your hak folder for you) http://nwn.bioware.com/players/167/downloads.html
You will need these within the next few days. Thanks!
Even though you have updated to 1.67, the module is associated with the seperate tileset haks so you still need to get the seperate Tileset Haks for 1.67. If you click the above link, it will let you choose the whole patch, the tileset w/demo, or scripts w/demo.
Download the Tileset w/Demo. Once downloaded you can then run the .EXE file that was downloaded, just remember where you saved it. After that you will be all set to play.