Although I have never done this, I think Washington Park near Cherry Creek would be a great place to be high at. It would be loads of fun with all the tall trees around you and the 2 lakes to look at. Lol for your first time I wouldn't go Six Flags for your first time, way too intense . As for the first question, for the spiritual experience, get outdoors. For your first time, I would do it indoors personally, because everyone responds to drugs differently. That last thing you'd want to be is uncomfortablly high at Washington Park.