Front Range or Rocky Mountain Metro
Front Range has a slew of builders there and many a hangar party on the weekends. Rocky Mtn Metro (KBJC) is a good place to stop for a bite, as their restaurant on the runway has good eats and views. Centennial is convenient but busy and IMHO kind of expensive. You can probably get transportation at any of the airports, so getting into town shouldn't be hard. Landing at Boulder would be nice too and Boulder is fairly close by. Even if you don't want to flight-see over the mountains, you can get some great pics flying along the front range near boulder, where you'll see the Flatirons and avoid DIA's class B with ease. Have fun, and thanks for supporting our local GA.