The hunting in 74 for ML is best around timberline, which is 11,500 ft. If you're from the East, that elevation is a serious matter, especially if you plan on hunting solo.
Be sure to take a water filter and drink as much water as you can on your way and when you get there, because it is dry and you'll need to watch out for altitude sickness which hydration helps with. Take it slow ascending. If you can get your hands on something like Cialis, it will help. I know, it sounds strange, but it works.
If you start feeling strange, lightheaded, get a bad headache, get nauseous or lose your appetite or especially coughing stuff up you need to descend ASAP, especially if you're hunting by yourself. I would highly recommend taking a SPOT or satellite phone. You can rent one. Eat protein and high energy stuff even if you don't feel like it.
Also, that country in the north of 74 is STEEP. Take your time and remember, you've got to haul out meat and that means multiple trips. Don't get yourself into trouble. Also, pay attention to weather. Lightning in the high country, and storms move in fast in the PM, ought to scare you and get you into the trees at the first sign.
You can have a lot of fun, but high altitude is no picnic and people not used to it can easily get into trouble. Be smart and make sure you make it back to whoever will be looking for you when your Colorado dream trip comes to an end.