If you are into knives at all, the Spyderco flagship store is there. I love it. Also, tons of great food in the downtown area, and I suggest doing the entire Lariat Loop (Red Rocks is on it); Buffalo Bill’s grave as well.
Not in Golden, but I suggest checking out Loveland Pass. It’s about 40 minutes away and is the highest continuously operational road in North America. Breathtaking.