Freewill
First: free will while we are living. If we do have any sort of free will, it is extremely limited. While learning about the brain for the last four years, I have been constantly bombarded with the biological factors that affect our actions and even our thoughts. There are an enormous amount of external and bodily influences on ourselves. Our breakfast or morning exercise routine affects our mood for the rest of the day. Even the weather and the color of the room we're in will change the decisions we make. Quite literally everything we come into contact with will force a series of events in our brain, which has to sort out all the information and decide what is important and what to do with it. But even our brain isn't who we ARE. It's just another organ. So even when our brain makes a decision, it isn't us. The only aspect of the human consciousness that the scientific community and altered-states-of-consciousness experimenters can agree on is that we are the Observer. We observe what our body and brain are doing, but that's all we can definitively say. We may have no influence at all.
Next: free will while tripping. The visuals and merging of our five senses(seeing sounds, for example) has been acceptably explained by the scientific community. For hallucinogens that imitate serotonin(LSD, psilocybin in shrooms), they act primarily on the Locus Coeruleus(LC). The LC branches out into all of our sensory regions of the brain. When the hallucinogen stimulates one sense, it travels to the other senses and can trigger a response. So, if we hear something, the LC can trigger an auditory response as well. Again, we play the role of an Observer. Notice that when we trip, we're pretty much just sitting back and observing/enjoying the experience.
Last: free will after death. Obviously, there are no definitive answers. But we can be sure that after leaving the body we are no longer constrained by all the influences I mentioned in "free will while we are living." Whether or not other influences still exist, I don't know. My guess is that we do sort of wander the planet and watch like in a movie like you suggested, but at some point we probably inhabit another body(newborns, I'm guessing). I can't say whether or not we have a choice in the matter though. All that could happen without free will. I don't think we'd stay in our bodies. It just doesn't seem very useful to remain there. However, I'm going to have my body cremated just in case. You know, force my soul or whatever out.
Either way though, life is pretty good. If I don't have free will, I'm strangely okay with that.
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1. Right View
2. Right Intention
3. Right Speech
4. Right Action
5. Right Livelihood
6. Right Effort
7. Right Mindfulness
8. Right Concentration
The Eightfold Path
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