If you do not include mourning the loss of all my friends, the first of all, if the weather was warm, I would walk around naked for some time, because no one would be able to comment on my body or feel violated by my nudity.
Then I would probably start to visit different libraries, both to take advantage of having them all to myself and to learn about surviving in the wild, such as hunting, building shelters and tools, cooking and maybe taming and training animals to help me hunt. Since no one would be there to operate the machines in power plants or public transportation or oil platforms, I would have to get around by foot or bike or horse and there would be no electricity or heat or running water in any houses, so my best options would be living close to the wild to have fresh water, materials to build with and animals.
At some point I would probably get existential as fuck over being the last human being on Earth, feeling incredibly lonely which might end in me killing myself.
If I didn't commit suicide, I would try to survive for as long as possible, trying to leave my mark on Earth, in case aliens would one day arrive and discover the ruins of some civilization, try to explain what happened (through visual images because they presumably do not know our languages or even our alphabets) and how our society works. Then when I knew that I could no longer go on, due to age, injuries or alike I would kill myself in the wild so that at least my body would be of use to the animals still around.
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