Been years since I was in CO, and that was in the Denver area -- another beautiful state, have fun with your trip! Folks already beat me to it about mountain sickness and dehydration. Drinks like Gatorade are pretty sugary and if you cut it say 50/50 with water it'll work better for staying hydrated. Powerade is even worse, way more sugar and junk in that. Another trick is just adding a little bit of apple juice to a bottle of water. If you want to get fancy, places like Walgreens carry a drink powder called "Drip Drop" that is supposedly good for dehydration (check near the baby supplies/Pedialyte aisle). Also, if it's hot, be sure to try and keep your body cooled down (shade, wet bandanna around neck, etc.). Chugging the fluids will only take you so far. Visiting the ER for dehydration shouldn't be on anyone's bucket list. Don't ask me how I know.