I'm a "flat lander" myself. Even though I live in the Ozark mountains the elevation never exceeds 1500 feet. The best way to beat altitude sickness that I've found is to acclimate slowly. The worst thing you can do is fly in from home straight to the mountains and drive directly to you camp up in the high country. Leave yourself a day or two for acclimation. spent some time in town generally around 3000 feet or so then head to camp leave yourself a day of acclimation, little or no strenous activity. Of course hydrate, hydrate, hydrate and when you think your eyes are floating drink some more water.