Oh hey, I am no longer banned for voting for the Tories! Cool. So, yeah, everything Kaz says is true. I will add a bit of details that I have so far:

DENVER INTERNATIONAL AIRPORT: It is a great airport, and I'll probably spend a good portion of the first day picking you guys up from the airport and shuttling you the 20 minutes to my house.

THE RODEO: It's the Greeley Stampede! It's a blast, lots of bull-riding and calf-roping and mutton-busting! And fireworks, since this will be our 4th of July trip. This is the main reason I'd like a RSVP before too long, because I'd like to purchase our tickets all at once so we can all sit together.

16TH STREET MALL: This is the "downtown" of Downtown Denver, and I'd feel that you failed to really see Denver unless we spent at least one day hanging out here. Lots of shops, places to go, things to see, and it's outdoors, so it has a chance of being rained out! Don't feed the hobos!

NATURE HIKES: Uh, haven't really planned this one out too much, but there are lots of different options:

• The Mountains!
  Pick a mountain, any mountain.
• The prairie!
  Take a left out my front door and walk a hundred yards.
• Redrocks!
  It's a two-hour drive, but just about the coolest bunch of red rocks you've ever seen.
• Boulder!
  Boulder or Golden, less of a drive than Redrocks or the Mountains, but a good fun place to take a hike, and in the Foothills, the base of the Rockies.
• The Beach!
  Just because we aren't near any ocean doesn't mean we don't have beaches! Crawdad fishing in the reservoir!
• The Ghetto!
  What tour of a major American city is complete without a tour of the Ghetto! Participate in a gang-shooting or buy some cocaine!

...um, got derailed with that list, let's see... Oh yes! Moving on to other potential activities:

MUSEUMS!
The big two in Denver are the Denver Art Museum and the Museums of Nature and Science, both of which are an absolute blast, and I haven't been to either since high school, so there would be something new for me to do as well.

THE ZOO!
The Denver Zoo. Dunno what else to tell you about it... it's big? It's so big you could go for three days in a row before you saw everything in it. Um... and there are animals there?

ELITCH GARDENS! (aka Elitch's)
It is THE amusement park of Denver, with at least four roller coasters, a Ferris Wheel, a Carousel... more "barf your guts out" rides than you can shake a funnel cake at... and a whole water park, too! It is a bit pricey, though.

WAL-MART!
The one near my house is actually a Wal-Mart Supercenter, which means it has a grocery store, a subway, a deli, a pharmacy, a barbershop, two banks and an auto-center built in, and is about half a mile long. If we want to grab some stuff so we can make meals back at my place, this would be a great place to do so.

Um... I guess that's all I got at the moment, post questions or comments or whatever here, and Kaz and I will try and answer them.

-=EDIT=-

Velk reminded me, I should talk a little about sleeping arrangements, so...
There are two houses, mine and my parents, code-named Northside and Southside, respectively.
Northside has: 1 futon, 2 couches, 1 big comfy chair, a back yard with room for 12 sleeping bags and tents, and floorspace for about 3-4 sleeping bags.
Southside has given me permission to utilize their basement, which has: 2 couches, 1 really big pillow, 1 big semi-comfy chair, and floorspace for about 12 sleeping bags.
There are also some decent, non-ghetto motels and hotels between Northside and Southside, but it's more fun for us to all pile in together.
Depending on volume, we will either be all at Northside (1-7 people show up), all at Southside (7-12 people show up) or we'll split it half and half (12-20 people show up). We might be able to arrange for some of Northside's couches to be at Southside if 7-12 people show up, which would be helpful on old people's backs.

Um, yeah.