Well, given thread postings, not sure you would like our hippie/millenial #resist mecca of boulder. Mixed with heavy traffic...
Parts of longmont pretty old and rundown, kinda a known rough area, but plenty of nice places to eat and do stuff if you just want to stay put. If you have just a weekend, not sure how much time you have to be driving all around. If you did you can always jump down to I70 into the mountains or highway 66 is right there going up into the mountains past lyons, but I'm unfamiliar with it. (Also mountains may still be shitty from our last blizzard a week ago though it's dry here in the front range) West and north into berthoud has some nice back roads that are faily scenic, mega houses to goggle at. It's especially nice on a motorcycle.
There is Carter Lake resevoir might be worth going to, I've been meaning to go up and check it out since I'm so close by.
Even being a native i'm not much of a tour guide because I dont get out much enough or take things for granted having always been here.