As far as finding some herb to burn, just remember that it is legal for adults over 21 to give (100% free) under an ounce to other adults over 21.....and we are very nice and sharing here
Any sales at all are illegal (until retail shops open next year to the public) unless it is a MMC selling to a redcard holder. Also remember that consuming herb in public is illegal, so don't go smoking a spliff walking down the street. Basically treat it like alcohol (keep it in your trunk when driving, no consuming in public, etc..) and enjoy CO!
Oh and I fully agree with BadAndy, Redrocks is amazing to go hike during the day or go to a concert at night!