I didn't read all of these entries, so I'm sorry if I'm reapeating. Here are my thoughts:

-More music variety (I have to turn my speakers down now, because the songs play in my head 24/7. But I do love the music score - I would just like more of it.)
-Details on characters at the bottom of the screen (somehow), or at least put the "done" button at the right side of the screen (vs. left side), or have the ability to press the enter key on the keyboard, so I am not moving my mouse around so much. (Wrist hurts from scanning around the island and in the details windows.)
-I would like the family tree capability, too, as others have suggested.
-More distinquished characters, so the old guys are not trying to hit on the teenagers.
-More area on the island to investigate.
-Retail stores for shoppping.
-I like someone else's idea of taking a group on a boat to another island so you can start a new game, and then possibly the two groups could interact?
-Larger characters, so we can see them better.