I used to go all the time in Colorado, back when I actually had friends. Some of the best memories were from camping trips with friends.
Usually for the weekend, so everyone would just get the cheapest 1-2 person tent from Walmart for around $40
No mats or sleeping bags, just a blanket on the bare tent floor
Firepit is free, just find stones
An ax for chopping wood
A pan for cooking everything
Flashlights
Booze... lots of booze
Weed... lots of weed
Guns... lots of guns
It was a super cheap way to spend a fun weekend, and usually the tents were so beat up after one use you just throw them away afterwards. Good times.