OK, here are some suggestions then.
Skip Staunton. I haven't ridden it but reviews from folks I know are meh. It gets a lot of attention because it's new.
Buff Creek is great for a long XC loop. There is camping but not at the main parking lot. I'm not super familiar with the camping scene so I'll let someone else chime in. A good loop would be up Nice Kitty, Little Scraggy clockwise, down Tramway, up Baldy, down Charlie's Cutoff to Sandy Wash. Without adding it up I think that's 35ish miles and gets most of the fun descents. Trails here are mostly smooth, decomposed granite (aka loose kitty litter) with smooth granite rock rolls.
White Ranch - a great option for tech. IMO it is harder than Ahab. Go up Belcher to Sawmill, down Mustang, back up Belcher, down Maverik and down Longhorn. Skip that stupid little extra thing at the top the MTB Project has and skip Rawhide. If you have excess energy go back up and do Longhorn again (or even go up Belcher to Shorthorn and down the very end of Longhorn). Belcher is a miserable climb in cool weather and just gets more unpleasent the hotter it is, but it's worth it for Longhorn. Little bit of everything on this loop - loose babyhead climbing, some flow, some rocky gnar, some very steep sections, and even a 4' huck to flat for good measure. Jeffco announced that lower Longhorn will be closed on Jun 17-18 for trail work so go before then.
I would not go to LHOHV. Yes I ride there and yes I like it a lot. However, I don't think it's the best place to demo a bike as the trails there are pretty unique. The climbs are on very steep jeep roads - steep enough most people walk a lot of it. Do you really need to know how well a bike hikes? The descents are not super rocky but they are very steep and very loose. Very little flow. I love riding there, but other than how a bike feels descending steep and loose, I don't really feel like you'll get a ton out of a demo there.
Other places I would recommend:
Bergen Peak in Evergreen. Not big mileage, but plenty of vert. Do it as mapped here: https://www.mtbproject.com/trail/632...rgen-peak-loop Temps will be 10* cooler than Denver, good views at the top, and lots of fun tech both up and down.
3 Sisters park in Evergreen. There's a lot of trails here and a lot of opinions on the best way to ride them but IMO the most fun is: from the eastern lot, take Ponderosa clockwise to Sisters, Sisters clockwise back to Ponderosa, Ponderosa counterclockwise to Sisters to Bearberry, up Evergreen Mountain west and down the east side (including the summit spur). Start and end from Dedisse trailhead if you want a few extra unnecessary miles. This has a bit of everything including some tech up and down, tight technical switchbacks, and fast flowy fun.
Since you will be here over a weekend keep in mind that everything in the Front Range is a shitshow on weekends. Timing descents at sunset is a good strategy...