Castle Pines in United States offers a unique experience to travellers. The nearest major city to Castle Pines is Colorado Springs. So, ideally any vacation planner would recommend you to visit Colorado Springs for its bountiful attractions like Coors Field, Union Station, Sports Authority Field At Mile High on your trip to Castle Pines. Also, to reach Castle Pines, you'll have to take a flight to Colorado Springs; so its not really a detour. And even if it is, the city is worth paying at least a quick visit. Most online packages to this city are of 1-2 days.
Yes,it is that simple really! Enjoy your trip! Keep travelling!