Favorite hidden secrets in EA worlds

I usually only use Sunset Valley, Appaloosa Plains, and Reviverview, and I don't often venture far outside of my sims house or the downtown area.

so lately I've been wondering what hidden secrets or cool venues there are to find in the other EA worlds. I was playing in Riverview yesterday and noticed a cropping of rocks that spawned geodes that I hadn't found before.

Another I recently discovered was how pretty the parks in Sunlit Tides are!

So... What other secrets am I missing?