The second island was viewable with the binoculars in the bar, and you could reach it by going underwater in one spot where Jeff forgot to flag the adjoin "not passable".
In the latest TDC (http://www.jedilegacy.net
) Drazen Isle was destroyed forever, so it would be worthless to remake it. Jeff has said that he won't remake it for any other game, nor make a sequel. In addition, he won't allow anyone else to make it (because it'll end up crap), so even if you do, none of the sites will post it.