A World of My Own

I'm trying my hand at making a custom world for The Sims 3. It's... more difficult than I thought it would be. It took over four hours just to sort out the mountains and get the roads connecting right, not to mention the bridges. I could raise them one minute and not the next, then I realized it was the grid disallowing it. Heh!

Now I don't really know what to do. There's so many things I could add but I don't know where to start. I found rather quickly that I missed the cluster of firs and pines from TS2. Didn't matter what you did, they always seemed to look good along mountain ranges. I can't seem to do anything decent with these ones. Doesn't look natural... just messy. Blargh.