I worked at Copper Mtn Resort for 6 years, and have both supported the ride as a volunteer and ridden it. Great fun, great route, great people. Very much worth it.
as mentioned previously, if not used to altitude my suggestion is to get there a couple days in advance. Stay away from coffee and booze for the first day or so. Water, water, and more water. Just when you think you’re going to puke water, drink more water. It helps a ton to acclimate even if you don’t have any problems.
have fun!