$this->bbcode_second_pass_quote('I_Like_Plants', 'A')nyplace in the US is going to be a hotbed of crime unless you're coming from one of those bad neighborhoods in England like 8 Ace or Ratboy from the VIZ Comic live in...
Beer is cheap, it's also overpriced for what it is since it's cheap piss with a headache in every can/bottle in the US. I warned you. Fortunately, imported stuff is proabably the same or less than you're used to paying in England so you'll be ok in the suds department.
There is essentially one AM radio station in the area - KOA, you can listen to G. Gordon Liddy! Right wing rants galore! There is one FM station, KILO, lots of mullet-head rage music but a fair amount of alternative too.
Gun clubs abound - do pop in and have a shot, as long as you're over 18 you can rent a gun an ammo and blast away. For the real "insurgent" experience, see if Dragon Man is still in business in Colorado Springs....
I lived in the Springs for a couple of years, some interesting stuff there, you can visit NORAD, the olympic center, Focus On The Family, all kinds'a stuff. There's also Pikes Peak and Garden of the Gods.
Forget getting around if you or people you're staying with don't have a car. This is true in 99% of the US. Colorado is a very "red" state.
For a possibly hippy experience, there's Boulder, I may consider popping up there myself while I still have the Prius, once my caricature-doodling skills are more developed, so I can try to have the trip pay for itself.
Baseball season is on, so you might try catching a game, that's a kind of American thing to do also
Enjoy your visit!

Denver has some of the best brewpubs in the US and is a favorite place of British beer writer Michael Jackson. Sooth Sayer, don't listen to ILP, he's a low class, complete idiot. He thinks the entire US is a hotbed of crime because that's what his ghetto of a neighborhood is.