I love assisting relocation buyers, and before they make the trip into Denver, I ALWAYS give them the advice to drink LOTS of water prior to their trip.  Denver's elevation is 5,280 feet!   Drink at least 32 ounces for a couple of days prior, and don't stop when you get here!     I have lived here almost my whole life, and one time went skiing first time to Vail, and got to the top of the mountain, and had to be taken down on a Toboggan.    I was dizzy, throwing up and felt AWFUL.   Must not have had enough water the day before.    Altitude sickness is real and comes on quickly.