Trip to colorado? packing checklist?

Are you going to the eastern plains where it will be 114 degrees and dry as a bone? Or are you going to Denver and staying in the city...where it can be hot, might rain, and you will be indoors most of the time? Or are you going up to 10 or 12 thousand feet where it will be cool , and you will need clothes for outdoor activities? Gonna spend your time in nite clubs and mall,s or white water rafting and mountain climbing? Staying in hotels, or camping in the national Forest?