This bonus geocache is NOT at the posted coordinates.
First, you will need the to install the "Adventure Lab" app available from the app store on your smart phone. (Android or IOS)
You will need to complete the "Historic Boulder Walkabout Part I" Adventure Lab in order to get the final coordinates. You will have 5 locations to visit before you can retrieve the co-ordinates. You may retrieve the co-ordinates at anytime after you have completed the tour by viewing the journal of the "Historic Boulder Walkabout Part I" Adventure Lab series. It will be listed on the final entry.
The bonus cache is located along a paved walking/biking path. At times the location can be very busy so stealth is needed!!!! The cache will hold some small swag. There are a couple small pencils in the container but you might want to BYOP.