The weather at the top was in the low to mid thirties and the finish line weather was in the mid 70’s so prepare accordingly. If you have thin blood, bring clothing with you that you can shed as you go. Blisters are a real issue for downhill running if you’re underprepared, due to the different type of stepping. This was my 18th marathon and I definitely have the worst blisters of my life, my fault of course, should have prepared better. Practice, practice, practice downhill running. I do some training for downhill running but not enough and my body definitely feels the difference. The first 4 miles of this course are tough and absolutely no joke so if you’re able to prepare by doing some altitude running, it would greatly benefit you, take in a count that you’re starting at 8000 feet. Do not power run this unless you have experience, it would be best to keep a comfortable pace and let gravity help your speed on the way down. I saw many runners who powered past me early on having a hard time later, some sick and many were walking from miles 19 on. There’s pretty much full sun exposure from mile 15 on, so a hat would help greatly. Overconfidence on this course from just thinking “it’s downhill so I got this” could lead to falling flat but if you prepare right, it could very well be one of the top runs you have.