I recently spent two weeks outside of Denver CO at about 5,000ft. I live on the east coast at about 265ft. Not a major problem. I drank more water than usual, and popped the occasional aspirin from time to time. I decided to drive from 5,000 feet to the peak of the Rocky Mountain National Forest at 14,000ft in 22miles. I was feeling fine at 5,000 feet, and even running 5 miles/day. BUT, at around 10,000ft I started getting a headache, and at the top I was feeling it pretty good. This ever happen to any of you? Airplanes don't get me, but this change in altitude did. Here's a few signs that I would sugest anyone traveling into Estes Park Rocky Mountain Nat Forest at the peaks should pay attention to now-Summer.:eek: Plus bring some aspirin. Lol!