Talk about yourself to others. It simulates the pleasure centers of your brain and releases dopamine (a chemical released when one experiences pleasure). There is an article on sciencedaily.com about it but I don't have the link. You can also run, laugh, eat, or do other things such as meditate. If you want to learn more about getting high naturally read "A Better High" by Matt Bellace. It is a really good book completely about natural highs.
Yes, Michael Jackson's voice was naturally high, a tenor.
Fiber
By not doing drugs, obviously.
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The ultraviolet radiation from the sun creates and destroys ozone naturally. It happens due to the high frequency of these waves.
exersizing, laughing, listening to music, and things that make you feel good can be a natural high.
Low is naturally the ground. High is (depending on weight and configuration in the 40K range.