There is a shuttle that takes you to the venue a half mile away 45 min, 30 min, & 15 min before the ceremony. It will also come 45 min, 30 min, & 15 min before the party is over @ 11:00pm
1) Uber, Estimated $40-$70 2) Take the A Train from the Airport to Union Station, $11 one way & 45 min. Then Uber from Union Station, Estimated $30-$50 3) Rent a car. If you want to explore Colorado, this would be your best bet. There are many parks and hiking trails close by the venue including Red Rocks park. 4) Transit Van Shuttle https://www.transitvanshuttle.com/quotes 5) This might be worth looking at: https://www.rome2rio.com/map/Denver-Airport-DEN/Littleton-CO-USA
There's a Safeway very close by!