This is a very subjective question, with many successfull answers.
For most people, the best way to trip is exactly what you think it will be.
A good concept of the best place to trip comprises two ideals: First, a place that is not completely under your controll. (90nder your controll would be acceptable, however.) Second, a place that you feel very comfortable with. Organic objects or complex, 'safe' artwork are good things to be around.
Personal experience dictates: Your own bedroom contains nothing new to enlighten you. Therefore, visuals and new concepts can be signifcantly diminished. If your live in the suburbs, your own backyard under a tree is a great start.
Ultimately, whatever you feel comfortable with is ideal. First timers should trip where they can easily feel safe. A bedroom is a fine place to start but nature is HIGHLY recomended.