The closest course to the airport is Green Valley Ranch. I have not played it but I have a friend who has and while he doesn't rave about it, it's good enough for him to go back. Murphy Creek is run by the City of Aurora and while I haven't played it either people I know like it. Saddle Rock is 5-10 minutes further also run by Aurora. I always found Saddle Rock to be difficult. It's hilly and easy to lose balls. Riverdale Dunes is owned by Adams County and designed by Pete Dye. It's not well known and a great value for a Pete Dye course. It isn't in as good a shape as typical Dye course, when I played it a couple month ago a couple par threes were undergoing maintenance so you had to hit off mats about 50 yards forward, but if you like Pete Dye you know exactly what you will get.