As someone who lives at 6,000 feet altitude, I know that it takes the body up to six months to fully acclimatize physiologically, but only a few days to cope much better. So the earlier you could arrive (a week before? three days before the race?) the better. Altitude WILL affect the way your body handles any substance like alcohol, so I would not drink the day before.
Other than that, all you can do is drink plenty of water and hope for the best, far as I know. The people who live at that altitude may have a bit of an advantage over you, but if you've never had any problems at altitude before, you should be OK.