Thunder Rock

A small rock that you can build on. It has a chairlift to start with and not much else.   If planned right you can build coasters on the edge of the rock and loop them inside, making a really cool coaster.  Its best to think of the inside of the mountain as a tool, not an obstacle.

Overall

On top of the rock, your space is limited, but you can make some decent rides.

Of course, building along the side can be a great way to get a coaster, you have much more room, just make sure that coaster type builds high enough

The multi level rock can cause problems, make sure there are enough paths to let people up and down.

Although a park of this size is usually a low rating, I'd give this one a 7.  Being able to hang coasters off the side is great, but not many can support that kind of height.