For commuters who have watched the Gaylord Rockies Resort & Convention Center rise to towering heights south of Denver International Airport, that chance to see what it all was about is coming soon. At precisely 12:18 p.m. Dec. 18, Colorado’s largest hotel will open its doors and the public is invited to come check things out. Workers are still scrambling to finish the hotel section and water park so those can obtain certificates of occupancy.