Things to do in Denver When You're Alive?

This coming Monday is our thirteenth wedding anniversay.

To celebrate, I’m taking my wife away to Denver, Colorado (thanks to Hilton Hhonors hotel points).

We’re going to be away for four nights, which will be the longest we’ve been away from our kids since we had our first almost eight years ago.

This is also going to be our first time away from them for more than a night since in three years.

I am SO looking forward to it!

Anyway, we’ve never been to Denver before and I’ve been researching things to do there and have a long list of possible activities but I was wondering, anyone who has ever been there, what you would recommend we should do or see while we are there. Are there any places we simply MUST visit? Restaurants we should walk past and wish we had the money to eat at?

What are your recommendations for things to do in Denver while you’re alive?