In Denmark they call a tree that looks like it has more stems a Mouse Lunch Box. It is believed that a mouse dug down its winter supplies and then forgot about it. That means that we after many years can see these big, gorgeous trees.
I recommend parking in New Lanark and taking the roughly one hour walk to GZ. You will stumble upon great viewpoints and breathtaking nature. First you will pass by Corra Linn which is the tallest waterfall in the park. When you've found the cache I recommend going a little further to see the widest waterfall on site, which happens to be my favorite. Worth another 10 minutes' walk.