Just sleeping is enough for me as far as hallucinating goes. I can have incredibly trippy and amazing dreams, and I tend to sleep for extended periods of time, usually even letting me remember most of my dreams if they were eventful enough.
Some drugs do seem appealing, however I am a bit weary of trying those which could fuck up my mind in the long run, so I don't really do anything these days. How can someone prevent themselves from actually accidentally killing themselves while hallucinating? At least while sleeping, your brain ensures that you're effectively paralized, so you can't truly hurt yourself by accident.