Best areas, that are on public land, usually require preference points. You can earn one per year. We have many units that have a over the counter bull tag but the legal bulls are usually few and far between. If you have horses and are willing to pack in 5-10 miles you might find some bulls.
http://www.wildlife.state.co.us is a good place to start looking. They have most of the info you'll need to find the better areas. Go to hunting, big game, statistics and look at the harvest reports, draw odds and unit info.
What makes for a good area to hunt for you? High success? Lots of elk? Few people? Trophy quality? You can have some combination of two or three of these things in unlimited areas, but not all 4. The only way to have all of those things is in a trophy unit.
And of course, coming right out and asking where the best place to hunt with an unlimited tag isn't going to get many responses. We may spend our whole lives looking for that "best" place and never find it. And those who did find a great area would probably like to keep it to themselves.
Here is a tip that was passed along to me - and I have not tried it yet - but it looks (and smells) like it will work fine! The gentleman that gave it to me regards it as his secret weapon and he is a VERY successful hunter.
Get a fresh tarsal gland off of a decent buck - I think the ranker, the better. Taking them off of bucks that are hot in the rut seem to be the best because that is when the glands are the darkest and have the most "male buck" scent...
Take that gland and put it in a good,...