I normally run around 200 ft elevation. From April 13 to April 18 I was in Colorado - around 6,000 ft.

A few things I read about which turned out true:

1) May have trouble sleeping at altitude. This happened to me. It may have been just not being in my own bed type of thing, but I did not sleep all that well.

2) Your breathing may sound louder than normal, but don't let it throw you. This was a strange one. I did a quick search to see if I could find the link, but could not. Maybe it was in Jack Daniel's book? I don't have it with me. When I ran in Colorado it sounded like I was struggling/laboring, but I didn't slow down and no problems occurred.

3) Use sun screen. It was very sunny and warm when I was in Colorado. More so than where I normally live. This is probably good advice anywhere/anytime.

4) I did not run on travel days. I generally run every day. I read that the first day you probably won't notice any difference, but later days you may. I was able to run my normal easy pace at the same heart rate I had been running at lower elevation. I did not do any quality workouts.

To be honest, I don't think it helped or hurt. Missing running days due to travel, and getting lousy sleep may have set me back a bit, but not too much.

Have a great vacation!

I live in Colorado at 8500 feet, but 15 years ago we lived in Kansas, and came out here every summer for vacation. I wasn't a runner then, but I remember acclimating after 4 or 5 days; usually started to enjoy physical things about the time we had to pack up and go home. . Lots of tossing and turning first couple of nights: drink lots of water; go easy on the alcohol. Yes, use sunscreen out here--the air is very dry and you are in thin air with less protection from the sun. I always wear a hat when I run.

I don't know anything about the Tahoe weather, but around here in July, you can expect thunderstorms with lots of lightning pretty much every summer afternoon--so do the outdoor things on your list in the beautiful sunny mornings.